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#4753128 - 05/10/18 02:55 PM Does diesel oil do more cleaning?
maverickfhs Offline


Registered: 12/28/16
Posts: 1870
Loc: VA
Maybe all of my threads are going to be towards diesel oil, since I plan to change oil in the Civic soon. thumbsup

Do oils like PP5W30 Euro AV do more cleaning than any other gasoline oil? For short tripping and 3K miles, would it clean anything or cause harm or no noticeable difference for a car like Civic?

I have no qualms using it, based on the thread I posted: https://bobistheoilguy.com/forums/ubbthreads.php/topics/4620526#Post4620526

Thanks for any advice and help.





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2006 Civic EX 200K/AT
2006 Acura TSX 177K/AT

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#4753158 - 05/10/18 03:36 PM Re: Does diesel oil do more cleaning? [Re: maverickfhs]
Char Baby Offline


Registered: 05/25/05
Posts: 9935
Loc: ROCHESTER, NY
I think that diesel oils have a higher level(PPM) of Calcium & Magnesium but, others will chime in with more info.
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'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'06 Mazda 3i 2.0L
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#4753165 - 05/10/18 03:44 PM Re: Does diesel oil do more cleaning? [Re: maverickfhs]
Imp4 Offline


Registered: 04/06/18
Posts: 244
Loc: Somewhere in time
Define cleaning.
Define the measurement of said cleaning.
Provide a method for measuring said cleaning action.
Report back with repeatable test protocol and verifiable, repeatable results.
Discuss.

Or..... speculate.....
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2001 Mitsubishi Galant 2.4 - 154k+
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#4753169 - 05/10/18 03:50 PM Re: Does diesel oil do more cleaning? [Re: maverickfhs]
1JZ_E46 Offline


Registered: 04/04/16
Posts: 1096
Loc: Oregon
I think all modern oils do a good job at cleaning with a shortened OCI. Thereís really no way to say which oil cleans better. All you will find is opinions.
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2007 BMW X5 4.8i, 105K: Castrol EDGE 0W-40, Mann
2012 Mini Cooper, 45K: Castrol EDGE 0W-30, Mann

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#4753184 - 05/10/18 04:10 PM Re: Does diesel oil do more cleaning? [Re: maverickfhs]
Dyusik Offline


Registered: 09/26/14
Posts: 1934
Loc: US-WA
My understanding was always that because diesels are sooty, the diesel rated oil has to be better at dispersing vs pcmo. I'm sure people that know can correct my assumptions.
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#4753195 - 05/10/18 04:19 PM Re: Does diesel oil do more cleaning? [Re: maverickfhs]
CT8 Offline


Registered: 10/09/14
Posts: 10732
Loc: Idaho
What are you going to be cleaning? Does it need to be cleaned.
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#4753244 - 05/10/18 05:28 PM Re: Does diesel oil do more cleaning? [Re: maverickfhs]
Dave1027 Offline


Registered: 05/02/18
Posts: 20
Loc: California
Many of the guys on the BMW forum swear by Rotella T6 (diesel oil) to clean out the ring lands which reduces oil burning. I always thought it was due to the high magnesium content.

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#4753346 - 05/10/18 07:05 PM Re: Does diesel oil do more cleaning? [Re: maverickfhs]
SubieRubyRoo Offline


Registered: 05/14/12
Posts: 1017
Loc: Winchester, Indiana
NONE of the major oils will put anything on their oils that say they "clean" dirty engines.

Pennzoil Ultra Platinum & Platinum say they "keep pistons xx% cleaner" than the standard.
Castrol Ultraclean GTX says it provides "50% more sludge protection"

There are other examples. Only a solvent can clean. Good oils can only reduce the amount of junk that gets deposited into the engine.

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#4753354 - 05/10/18 07:10 PM Re: Does diesel oil do more cleaning? [Re: maverickfhs]
jayg Offline


Registered: 10/04/12
Posts: 1191
Loc: Rabbit Creek, Alaska
For 3k mile intervals in a Civic, use the cheapest name brand conventional oil on clearance. I pay for expensive diesel oil only when I have an application that I have to use it for DPFS and soot. You don't have that so save your money.
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#4753425 - 05/10/18 08:05 PM Re: Does diesel oil do more cleaning? [Re: maverickfhs]
JeffKeryk Offline


Registered: 01/09/10
Posts: 182
Loc: Los Gatos, CA
From:
http://www.machinerylubrication.com/Read/28576/comparing-gasoline-diesel-engine-oils-

Diesel engine oil has more additives per volume. The most prevalent are overbase detergent additives. This additive has several jobs, but the main ones are to neutralize acids and clean. Diesel engines create a great deal more soot and combustion byproducts.

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#4753454 - 05/10/18 08:24 PM Re: Does diesel oil do more cleaning? [Re: SubieRubyRoo]
1JZ_E46 Offline


Registered: 04/04/16
Posts: 1096
Loc: Oregon
Originally Posted By: SubieRubyRoo
NONE of the major oils will put anything on their oils that say they "clean" dirty engines.

Pennzoil Ultra Platinum & Platinum say they "keep pistons xx% cleaner" than the standard.
Castrol Ultraclean GTX says it provides "50% more sludge protection"

There are other examples. Only a solvent can clean. Good oils can only reduce the amount of junk that gets deposited into the engine.


Iíve seen oil filters cut open on a dirty engine after short synthetic OCIs. There is certainly some cleaning going on. Lots of black grit.
_________________________
2007 BMW X5 4.8i, 105K: Castrol EDGE 0W-40, Mann
2012 Mini Cooper, 45K: Castrol EDGE 0W-30, Mann

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#4753623 - 05/10/18 11:17 PM Re: Does diesel oil do more cleaning? [Re: 1JZ_E46]
clinebarger Offline


Registered: 12/19/13
Posts: 1839
Loc: Fort Worth, Texas
Originally Posted By: 1JZ_E46


Iíve seen oil filters cut open on a dirty engine after short synthetic OCIs. There is certainly some cleaning going on. Lots of black grit.


But a "dirty engine" has 1000 times more black grit sludge still in the engine....
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#4753628 - 05/10/18 11:28 PM Re: Does diesel oil do more cleaning? [Re: maverickfhs]
BrocLuno Offline


Registered: 09/06/15
Posts: 5403
Loc: Kalifornia Kollective
Port injected Civic with how many miles and what service history?

You want clean, put a full can of BG109 in there for teh last 100 miles and change the oil. Or, put 5 ounces of SeaFoam in the crankcase for a 20 minute gentle drive around the block and change the oil. Either will clean stuff no basic oil will touch.

But what are we trying to clean? Varnish? Sludge? Something else ...
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#4753663 - 05/11/18 01:01 AM Re: Does diesel oil do more cleaning? [Re: maverickfhs]
FordCapriDriver Online   content


Registered: 10/22/15
Posts: 2359
Loc: Balearic Islands , Spain
HDEOs do have a healthier dose of dispersants, since when used in Diesel engines they are pumped ful of soot they have to keep in suspension.
I am using a HDEO in my Escort to hopefully help clean it up, the previous owner did not change the oil regularly, although i intend to keep using HDEO for the high Zddp and the 15W-40 viscosity is perfect for the CVH with over 100k miles.

Rocker cover gasket change 09-05-2018 by Argentum Enim in Sempiternum, en Flickr

Took the valve cover off the other day to change the rocker cover gasket, the valvetrain itself was not too bad the but the underside of the rocker cover was caked in oil deposits and the PCV outlet was clogged.
_________________________
1975 Ford Capri II Ghia 3000 V6, - Valvoline VR1 20W-50
1988 Ford Escort MkIV 1.6 Xr3i Cabrio, - Shell Rimula R4X 15W-40 HDEO.

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#4753697 - 05/11/18 03:32 AM Re: Does diesel oil do more cleaning? [Re: JeffKeryk]
SonofJoe Offline


Registered: 07/23/16
Posts: 1052
Loc: Europe
Originally Posted By: JeffKeryk
From:
http://www.machinerylubrication.com/Read/28576/comparing-gasoline-diesel-engine-oils-

Diesel engine oil has more additives per volume. The most prevalent are overbase detergent additives. This additive has several jobs, but the main ones are to neutralize acids and clean. Diesel engines create a great deal more soot and combustion byproducts.



It is received wisdom that overbased metallic detergents carry out a 'cleaning' function in engine oil. In my experience, this just isn't true.

To understand what an overbased detergent actually is, try and imagine a beaker which contains one third powdered chalk (calcium carbonate) and two thirds of mineral base oil. The resultant gritty, opaque, gooey mess might not be something you'll want to put into your engine if your objective is keeping things clean! It would also block your oil filter in minutes.

Now imagine you can remove from the beaker a bit of the base oil, and replace it with some 'neutral' calcium alkyl sulphonate (often referred to as 'soap') which, through the magic of colloidal dispersion, breaks up those particles of calcium carbonate to the point where they're soooooooooooo small, the mixture becomes transparent. That's essentially what an overbased detergent is.

The primary purpose of the calcium carbonate in detergent in to neutralise acids (just imagine putting citric acid in your kettle to react with limescale...same thing!). The primary purpose of the calcium alkyl sulphonate is to colloidally disperse that inorganic base (hence the term 'overbased'). Now some folks will tell you that the same calcium alkyl sulphonate will keep those acid-base reaction products dispersed in the oil and help prevent deposits dropping out. I think at one point this was probably true but in today's environment, I'm not sure it is and if it still is, then it's a very minor effect.

Hope that helps...




Edited by SonofJoe (05/11/18 03:33 AM)

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