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Can Marvel Mystery Oil be used reliability?

Posted By: GSLex

Can Marvel Mystery Oil be used reliability? - 01/27/18 08:05 PM

Hi there,

I just bought myself a Lexus LS430 after 3 years of search with only 100.000km and every possible option. I am happy as a child!

The LS is from 12-2004 and had 7700km a year. My idea was to preventive use this MMO to clean the carbon and all the other lubrications.

And what is in fact, very very important to me, is that I want to be 100% sure that this additive cant Absolutely do no harm by any chance?
I always have very expensive problems with cars and again, I must be 1000%!!!

If you have any other suggestions please let me know. I would really appreciate that.

Posted By: Trav

Re: Can Marvel Mystery Oil be used reliability? - 01/27/18 08:10 PM

At 100K Km (60K miles) I wouldn't even think of it. Change the oil on schedule and forget it. Don't kill the thing with kindness.
Posted By: aquariuscsm

Re: Can Marvel Mystery Oil be used reliability? - 01/27/18 08:26 PM

NO additives. Only use oem spec motor oil.
Posted By: Donald

Re: Can Marvel Mystery Oil be used reliability? - 01/27/18 09:15 PM

The only mystery about MMO is why people still use it. Snake oil.

Use quality synthetic oil and a PEA based fuel injection cleaner as per directions.

Avoid additives.

Nothing is 100%. You do the best you can.
Posted By: Leo99

Re: Can Marvel Mystery Oil be used reliability? - 01/27/18 09:32 PM

Why are you worrying about a problem that has a very low probability?

Post some pictures and enjoy your new car.
Posted By: Vladiator

Re: Can Marvel Mystery Oil be used reliability? - 01/27/18 09:39 PM

MMO is 1000% safe in proper amounts. No more than 20% of full oil capacity, and no more than 1qt/10gallons of gas in the fuel. If you keep it around these numbers - MMO will do some cleaning, I have experienced it first hand on many vehicles and am very satisfied. The MMO will burn off in the oil after a couple hundred miles, so check your oil level and keep it at proper level by refilling with MMO or motor oil.

Good luck with the vehicle! It is a great one, best car ever made.
Posted By: Wolf359

Re: Can Marvel Mystery Oil be used reliability? - 01/27/18 09:50 PM

Yeah, I wouldn't use any snake oils. What should be telling is that no manufacturer recommends it. Just change the oil on a regular schedule and do scheduled maintenance like transmission fluid changes, coolant flushes etc on time and you should be fine.
Posted By: JC1

Re: Can Marvel Mystery Oil be used reliability? - 01/27/18 09:52 PM

Originally Posted By: GSLex
I always have very expensive problems with cars and again, I must be 1000%!!!

If you have any other suggestions please let me know. I would really appreciate that.



Why do you have expensive problems? I would use quality a and filter and leave the additives out of the motor.
Posted By: demarpaint

Re: Can Marvel Mystery Oil be used reliability? - 01/27/18 09:53 PM

IF the engine needs cleaning it will work quite well and do no harm.
Posted By: JHZR2

Re: Can Marvel Mystery Oil be used reliability? - 01/27/18 10:14 PM

MMO? Don't see much of a reason/need.

What I personally would do, given that I'd be doing the oil changes, is to do 2-3 short duration OCIs to get any old oil pilot, help clean if needed, and just to get on a fresh page. Ditto for ATF, diff oil and coolant. Id swap brake fluid too.

That way I'd personally know the status and composition of all fluids. It would be peace of mind, not much else.
Posted By: jj51702

Re: Can Marvel Mystery Oil be used reliability? - 01/27/18 10:16 PM

Great thread title
Posted By: BrocLuno

Re: Can Marvel Mystery Oil be used reliability? - 01/27/18 10:43 PM

Originally Posted By: Vlad_the_Russian
MMO is 1000% safe in proper amounts. No more than 20% of full oil capacity, and no more than 1qt/10gallons of gas in the fuel. If you keep it around these numbers - MMO will do some cleaning, I have experienced it first hand on many vehicles and am very satisfied. The MMO will burn off in the oil after a couple hundred miles, so check your oil level and keep it at proper level by refilling with MMO or motor oil.

Good luck with the vehicle! It is a great one, best car ever made.


+1 smile

Been using MMO for close to 50 years for some things. It does help some situations. It is safe. But a Lexus with only 60,000 miles ... Unless badly abused by previous owner, not needed. Run premium oil and by 100,000 miles it'll be clean as a pin smile
Posted By: CharlieBauer

Re: Can Marvel Mystery Oil be used reliability? - 01/27/18 11:06 PM

Firstly, congratulations on the car. It sounds like a car that you want to keep running for ever.

Change all the fluids with quality products and stay away from additives to those fluids. The fluids contain everything needed.

If the new oil gets dirty quickly, then change it at a conservative interval and observe and record how dirty and when it gets that dirty the first, second, third time. You could do a used oil analysis if you want to be sure about things. I would.

I'd be tempted to get an analysis for transmission fluid as well. Again, it's about ruling out any problems and understanding the situation to help you plan your maintenance.

Brake fluid is something that may benefit from a second flush a few weeks or months after the first one.

You should aim to exchange all fluids completely including power steering and coolant.

Look at the maintenance schedule for other things such as spark plugs.

Find a PEA fuel system cleaner (not a non PEA cleaner and not a fuel injector cleaner). Use it once now and if there is an improvement, do it again just before an oil change. Then go by feel for subsequent usage.
Posted By: ZZman

Re: Can Marvel Mystery Oil be used reliability? - 01/28/18 12:16 AM

It won't hurt anything. But if cleaning us your main goal but a oil with alot of detergents.
Posted By: fdcg27

Re: Can Marvel Mystery Oil be used reliability? - 01/28/18 12:26 AM

Given your user name, do you have a GS as well, or have you had one?
What grade of oil does Toyota recommend for these engines in Europe?
A 0W-40?
I wouldn't use MMO in any decent engine personally although there are those here who aren't fools who would beg to differ.
If your car had good maintenance over its working life, it shouldn't need any engine cleaning anyway.
If you really do feel that some internal cleanup is needed, it's more likely carbon in the combustion chambers and maybe some minor deposits around the fuel injector nozzles.
This can be fixed, if it's even there, with a dose of a PEA fuel system cleaner run through a tank of fuel.
This car probably has ample fuel capacity, so a dose in half a tank might be advisable.
It sounds as though you got a very nice example of Toyota's best car.
I hope that you enjoy it and use it as it was intended to be used.
These cars have the power as well as the poise to be seriously fast runners where that's allowed.
Posted By: Linctex

Re: Can Marvel Mystery Oil be used reliability? - 01/28/18 12:35 AM

Originally Posted By: Donald
The only mystery about MMO is why people still use it. Snake oil.


You can use MMO in the petrol if you choose, as it has proven benefits there.

I have never used it in the oil, I don't think I ever will.
Posted By: CajunLariat

Re: Can Marvel Mystery Oil be used reliability? - 01/28/18 12:54 AM

I bought my F150 with 40000 original miles. The vct solenoids were causing it to make engine noises. My dad suggested to add a quart to the second oil change. After 3000 miles I drained it and now have 0w40 mobil1 in it now to finish the process. It's a bit more quiet to. After 3000 miles I am going to drain it and use CASTROL Magnatec 5w20 with a fram ultra filter up to 7500 miles.
My dad mixed 50-50 mmo and deep creep to do an over night piston soak on my 1996 Toyota Corolla. It was burning a qt of oil about every 1200-1300 miles. After 2 piston soaks, the 2nd one was 2 days, it now only burns about a qt every 700-800 miles. I also replaced the factory installed pcv valve. I am running DELVAC SUPER 1300 10w30 oil with a fram ultra filter. I would say that snake oil mmo works great in some cases.
Posted By: 28oz

Re: Can Marvel Mystery Oil be used reliability? - 01/28/18 01:18 AM

Originally Posted By: CajunLariat

My dad mixed 50-50 mmo and deep creep to do an over night piston soak on my 1996 Toyota Corolla. It was burning a qt of oil about every 1200-1300 miles. After 2 piston soaks, the 2nd one was 2 days, it now only burns about a qt every 700-800 miles.


As written, it sounds like your piston soaks made it a lot worse!
Posted By: MRtv

Re: Can Marvel Mystery Oil be used reliability? - 01/28/18 03:01 AM

I use MMO in my gas both on my Versa Note and the F150. I put in 3oz for every ten gallons. I use it for the continuous cleaning of the injectors and upper cylinder lubrication properties. I stopped for awhile in the Versa Note and my wife asked me if I was still using it? I told her no and she asked me to start using it again. She claimed she saw a drop in gas milage. She says it went back up after starting to use it again. So I keep it in pretty regular for her.

I do use a pea cleaner just before oil changes. I also use a Top Tier gas in the vehicle. I am willing to bet the engines fuel system is pretty clean. Whatever people claim for or against MMO I found my wifes observation rather interesting.
Posted By: CajunLariat

Re: Can Marvel Mystery Oil be used reliability? - 01/28/18 03:09 AM

Originally Posted By: 28oz
Originally Posted By: CajunLariat

My dad mixed 50-50 mmo and deep creep to do an over night piston soak on my 1996 Toyota Corolla. It was burning a qt of oil about every 1200-1300 miles. After 2 piston soaks, the 2nd one was 2 days, it now only burns about a qt every 700-800 miles.


As written, it sounds like your piston soaks made it a lot worse!

Yeah, I got that backwards. D'OH! It only burns a qt every 1200-1300 milres now compared to before at 700-800 miles. But it really worked. Mmo is good by itself but my dad said he has done this before. My Corolla now has over 255000 milres on it.
Posted By: GSLex

Re: Can Marvel Mystery Oil be used reliability? - 01/28/18 06:41 PM

Hello Gentlemen, AT first. Thank you for all your comments and advises. I think its better to make a summary.

I lost a bizar amount of money in a year with a 100k km AMG 6.2 Mercedes. (Double that with the depreciation after one year and I really intended to keep that car forever) After this distaster I decided to find myself the best car in the world and now I got it I am trying to make it better and making all sorts of plans. (Rims, maintenance etc)

I think the first reply of Trav hits the spot. I am really careful with everything and I,m extreme in detailing and making everything perfect. (Ill post some pics later when I have my Mac back)

@ Ffdcg27 I have an 2004 old model GS300 Executive as well but I gave that to my mum because she deserves a safe car.

@Charley, Yes thats how I am going to do it.

I always use Mobil1 and Nothing else. (My old AMG drank 10 liters of 0w40!!!!!!!) Only the most expensive green one as well and I am buying it directly from the main importer over here. Why Mobil? I heard you guys talking about it years ago and thats why I am totally convinced.

I still have a big jerrycan of 0w40 from the AMG era and 5w30 for the GS 2JZ and I,m really feeling to open a new topic with the question what I should use for the new LS430 3UZ-FE v8.

The LS had his oil changes every 15 to 20k km (more 20 then 15).

And the title of the topic should have been Reliable.... No no I wasn't smoking or anything haha

Last point. You guys are talking about some fuel treatment to clean the injectors. Can you advice a type or a brand which is the very best? I used Forte many times in the past but now It has been sold to Wynns (I heard that from one of the previous owners or stockholders... don't really remember) the formula is WAY more weak and now you need 2 bottles to have the same result as before with 1 bottle.

Thanks again for all your reply's.
Much appreciated.
Posted By: CharlieBauer

Re: Can Marvel Mystery Oil be used reliability? - 01/28/18 08:06 PM

Originally Posted By: GSLex
Last point. You guys are talking about some fuel treatment to clean the injectors. Can you advice a type or a brand which is the very best? I used Forte many times in the past but now It has been sold to Wynns (I heard that from one of the previous owners or stockholders... don't really remember) the formula is WAY more weak and now you need 2 bottles to have the same result as before with 1 bottle.

Thanks again for all your reply's.
Much appreciated.


Look for Techron and try to get the fuel system cleaner version not the fuel injector version. If you are able to review actual ingredients of any product, you want it to contain 30% or more of polyetheramine.

If you can only find the fuel injector version, you'll need to use about 6 of them in one go.

For the oil, I would use the M1 0w40. But interested to know which 5w30 you have and what approvals it has.
Posted By: nthach

Re: Can Marvel Mystery Oil be used reliability? - 01/31/18 12:54 AM

From experience, all you need really is good oil and filter. Those Toyota V8s are good, strong engines and they are easy on their oil(as long as its changed regularly). A bottle of a good PEA-based injector cleaner wouldn't hurt - Techron and Gumout isn't in Europe - maybe Lubro Moly Jectron or if you can find BASF's Keropur bottled up for sale somewhere.
Posted By: Trav

Re: Can Marvel Mystery Oil be used reliability? - 01/31/18 12:36 PM

This one works and from my experience is the only one worth buying from LM.

https://www.amazon.de/Liqui-Moly-Pro-Lin...benzin+reiniger

Edit: It is used in a tool directly into the fuel rail but works well if used in the tank also.
Posted By: daves66nova

Re: Can Marvel Mystery Oil be used reliability? - 03/03/18 02:27 AM

Originally Posted By: Wolf359
What should be telling is that no manufacturer recommends it.
they probably don't because then that might imply that their engines are going to need an additive when the miles rack up.
Posted By: jakewells

Re: Can Marvel Mystery Oil be used reliability? - 03/03/18 11:52 AM

MMO cured my lifter knock in my 2.9 v6 ford ranger a few years back so it isn't snake oil.
Posted By: eyeofthetiger

Re: Can Marvel Mystery Oil be used reliability? - 03/03/18 02:15 PM

Originally Posted By: jakewells
MMO cured my lifter knock in my 2.9 v6 ford ranger a few years back so it isn't snake oil.


Right. It's actually mint oil. Makes a great mouthwash or aftershave. Did I already use that joke? wink
Hey, I use it in my stinky old truck. It really freshens it up.
Posted By: andyd

Re: Can Marvel Mystery Oil be used reliability? - 03/08/18 09:48 PM

MMO used as directed on the label will do no harm to an engine or a cat. If your vehicle doesn't respond to MMO, it probably is a good sign. It was designed for sticky lifters and gunked up carbs, to help out an older engine. The smell reminds me of the goo we rubbed on our legs in cross country or hoss liniment. grin2
Posted By: RemingtonHill

Re: Can Marvel Mystery Oil be used reliability? - 03/30/18 01:14 AM

I would do whatever the major ~60K service interval requires. Timing belts (if any) water pump, all fluids (especially transmission/differential), grease chassis, etc. It's what I do on used cars I buy - should be all you'd need to do. How are tires, brakes, battery, etc.? Do all that stuff, throw techron in a couple tanks of gas and if it's running perfect and idling smoothly, call it day.

Keeping up with the service intervals and oil/filter changes is whats going to make it last as long as possible - not some snake oil.
Posted By: Tundragod

Re: Can Marvel Mystery Oil be used reliability? - 03/30/18 01:34 PM

I tried this snake oil for a 24hrs piston soak. Will see in a few months if it does anything.
Posted By: Toh1

Re: Can Marvel Mystery Oil be used reliability? - 06/09/18 09:41 AM

So after using only oil for 40000 clean engine?
Posted By: kschachn

Re: Can Marvel Mystery Oil be used reliability? - 06/09/18 12:08 PM

Originally Posted By: daves66nova
Originally Posted By: Wolf359
What should be telling is that no manufacturer recommends it.
they probably don't because then that might imply that their engines are going to need an additive when the miles rack up.

Do I need one? I havenít used any except once I used a bottle of fuel system cleaner in the BMW when it had a rough idle. That turned out to be a pushed-back pin in a fuel injector connector.

What do I need with my high mileage engines?
Posted By: Marco620

Re: Can Marvel Mystery Oil be used reliability? - 06/24/18 04:04 PM

+1
Posted By: andyd

Re: Can Marvel Mystery Oil be used reliability? - 06/29/18 04:45 AM

MMO is only 5$ a qt around here. Used as directed it won't damage anything. Closest thing to a blind test happened when I filled my wife's 528e and gave it a dose. A couple of days later, she asked where the last tank of gas came from, because she noticed more pep. As I said before; If you don't notice a difference, don't use it.Use the rest to oil hinges.
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