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About oil change once a year #4654027
02/02/18 03:43 PM
02/02/18 03:43 PM
Joined: Apr 2015
Posts: 13
TX, USA
Boomerang Offline OP
Boomerang  Offline OP
Joined: Apr 2015
Posts: 13
TX, USA
Hi All,

Most synthetic oils wants to change once a year, even though the miles are not that much. Any reason? Is it because of the condensation issue? For eg: Amosil XL wants to change it at 6 months/10k miles.

In my case i use Amsoil XM 0W20 in Honda Odyssey at at 4700 miles, it shows 15% life in OLM. This oil is rated for 6 months / 10k miles. Can i just change the filter and go on for another 5k? Its about 5.5 months on this oil. Oil does not look dark at all. I guess OLM is tuned for dyno 5W20 oil (2010 Odyssey).

Also in my 2000 bmw Z3 2.5, i used the 5W40 Amsoil (the most expensive one). It is almost a year and i drove only 5K miles on it. The OLM on car shows lots of life left, but oil is one year old and Amsoil says life is one year for this oil. Oil still looks ok. Not dark or black.

I searched for this and could not find any clear explanation.

Thanks

Re: About oil change once a year [Re: Boomerang] #4654029
02/02/18 03:47 PM
02/02/18 03:47 PM
Joined: Jun 2002
Posts: 12,651
The Motor City
Kestas Offline
Kestas  Offline
Joined: Jun 2002
Posts: 12,651
The Motor City
I believe the oil manufacturers use this recommendation because of condensation issues. I never consider time when changing oil -- just miles. The only exception is if I know I'm short-tripping a car, especially in the wintertime.

Re: About oil change once a year [Re: Boomerang] #4654034
02/02/18 04:01 PM
02/02/18 04:01 PM
Joined: Nov 2008
Posts: 3,299
Oshawa, Ontario Canada
JC1 Offline
JC1  Offline
Joined: Nov 2008
Posts: 3,299
Oshawa, Ontario Canada
Why not try running the oil in the Odyssey for 7500 miles and then get a UOA to see how it holds up? Does the Odyssey have the VCM?


2015 Grand Caravan SXT Plus 5w-20 PPPP/Fram Ultra Filter
1997 Honda Civic CX 5w-30 Shell Conventional/Fram Ultra Filter
Re: About oil change once a year [Re: Boomerang] #4654041
02/02/18 04:07 PM
02/02/18 04:07 PM
Joined: Apr 2015
Posts: 13
TX, USA
Boomerang Offline OP
Boomerang  Offline OP
Joined: Apr 2015
Posts: 13
TX, USA
No.. it does not have VCM. No no shutting down of cylinders.

I doubt it will go up to 7500 miles before the OLM start going -ve side. Since out of warranty, i guess it should be ok. Will take another 3 months minimum to hit 7500 miles. I guess i can just change the filter (using Honda filter) and reset the OLM and go till 7500 miles and see how it goes? It runs lots of short trips.. Picking up kids from school, shopping etc within 5 mile radius.

BMW, drives 15 miles one way and 30 miles a day in total.

Re: About oil change once a year [Re: Boomerang] #4654063
02/02/18 04:32 PM
02/02/18 04:32 PM
Joined: Mar 2016
Posts: 1,255
CA
CharlieBauer Offline
CharlieBauer  Offline
Joined: Mar 2016
Posts: 1,255
CA
Time based intervals are there to cover the worst case scenarios of usage, especially colder climates and short trips.

Your usage may not fit that scenario. Being in Texas will certainly help.

The best way to figure it out is to get a UOA, which is what I did to make me comfortable when exceeding manufacturer recommendations. My short trips have an effect but in California the effect is nowhere near as bad.

On the Honda, get a UOA done when the OLM is close to zero. On the BMW, I think you can go further than a year but I wouldn't wait until the OLM is near zero to get a UOA. Maybe get the UOA when there is 30% life left (you might need to extrapolate that if the OLM turns over suddenly due to time interval).

If possible sample rather than drain.

For the UOA, make sure you get a TBN, ideally oxidation as well.


It ain't what you don't know that gets you into trouble. It's what you know for sure that ain't so.

- mistakenly attributed to Mark Twain
Re: About oil change once a year [Re: Boomerang] #4654083
02/02/18 04:57 PM
02/02/18 04:57 PM
Joined: May 2013
Posts: 681
Florida
SilverSnake Offline
SilverSnake  Offline
Joined: May 2013
Posts: 681
Florida
Boomerang: I have posted this article before and it has been ridiculed by many on this forum as oil industry garbage and part of the big conspiracy to get us all to change our oil more frequently than necessary. I do not agree and find the article to be an excellent summary of the issues involved. I am posting the entire article since I cannot find the link on the net anymore. I hope you find it useful.

Amsoil Article: Chemical Reactions Occur in Motor Oil, Even When Not In Use
By Dan Peterson, Vice President, Technical Development, Amsoil, May 2012


http://www.1st-in-synthetics.com/Tech/Chemical_Reactions_Occur_In_Motor_Oil_Even_When_Not_In_Use.htm

Last edited by dnewton3; 02/02/18 08:56 PM. Reason: copy removed; link added

2016 Charger, 6.4L-485 HP (PUP 0W-40)
2017 BMW 330i, 2L-248 HP (BMW 0W-20)
2018 Jeep GC, 5.7L-360 HP (PP 5W-20)
2008 20KW Generac (Amsoil 10W-30/30)
Re: About oil change once a year [Re: Boomerang] #4654085
02/02/18 04:58 PM
02/02/18 04:58 PM
Joined: Apr 2015
Posts: 13
TX, USA
Boomerang Offline OP
Boomerang  Offline OP
Joined: Apr 2015
Posts: 13
TX, USA
Thanks.. will wait and when it reaches like 5%, will send it for testing.

BMW, i think i will wait till it reaches like 7500 miles and see how it goes.

Both vehicles are not burning any oil. So never had to add any oil. One is at ~74k and other at ~135k.

Re: About oil change once a year [Re: Boomerang] #4654100
02/02/18 05:08 PM
02/02/18 05:08 PM
Joined: Jul 2017
Posts: 542
Texas (south)
FermeLaPorte Offline
FermeLaPorte  Offline
Joined: Jul 2017
Posts: 542
Texas (south)
I consider miles, not time.

Oil manufacturers do testing. They do know their bits. But also, they will advertise the results that benefit them on marketing.

Whatever the case, you know your cars and so you can decide what's best for them.


Always Mobil 1
2014 1.6L Nissan Versa Sedan, 5 spd, 5k OCI.
2011 3.5L Chevrolet Impala, Automatic, 5k OCI.
Re: About oil change once a year [Re: Boomerang] #4654145
02/02/18 05:43 PM
02/02/18 05:43 PM
Joined: Jul 2013
Posts: 2,288
Outer Banks, NC
NormanBuntz Offline
NormanBuntz  Offline
Joined: Jul 2013
Posts: 2,288
Outer Banks, NC
Originally Posted By: Boomerang
No.. it does not have VCM. No no shutting down of cylinders.

I doubt it will go up to 7500 miles before the OLM start going -ve side. Since out of warranty, i guess it should be ok. Will take another 3 months minimum to hit 7500 miles. I guess i can just change the filter (using Honda filter) and reset the OLM and go till 7500 miles and see how it goes? It runs lots of short trips.. Picking up kids from school, shopping etc within 5 mile radius.

BMW, drives 15 miles one way and 30 miles a day in total.


One thing you could do that makes sense is follow the Honda OLM for the time to change the oil, but use a Fram Ultra for two or up to three intervals. It's now rated for 20,000 miles.


2017 Honda Odyssey SE, 17K
2013 Honda Accord LX, 58K
2007 Honda Ridgeline RTS, 89K
2007 Infiniti M35, 107K
Re: About oil change once a year [Re: Boomerang] #4654188
02/02/18 06:33 PM
02/02/18 06:33 PM
Joined: Jan 2016
Posts: 849
NC
Vladiator Offline
Vladiator  Offline
Joined: Jan 2016
Posts: 849
NC
So this is a bit extreme, but... here is what happens to oil when it sits in the engine for too long, regardless of miles. Steady diet of Castrol synthetics, but for 5+ years engine was just sitting. Engine is in good condition, for a 1990s BMW at least. But oil pan and oil filter cup are filled with this gunk because the oil was just sitting there, and over time oil lost its properties. None of this is present anywhere else, but the pan and oil filter cup. Do not leave contaminated used oil in the engine for too long, change every 1, or Max 2 years.








Re: About oil change once a year [Re: Boomerang] #4654218
02/02/18 07:09 PM
02/02/18 07:09 PM
Joined: Nov 2010
Posts: 2,836
California
Errtt Offline
Errtt  Offline
Joined: Nov 2010
Posts: 2,836
California
Wife's RX330 gets once a year oil change. She drives very little. Less than 1k on the clock a year. So I'll take it out a couple times for a freeway/highway run. Currently running synthetic. Just done an oil/filter change a little more than a month ago and the drained oil looked nearly new out of the jug.
Her previous vehicle I used conventional oil. Same driving conditions and it also looked like new draining after a year use. Had before thought of doing 2 year oil/filter change, but couldn't pull myself to doing that.
Could not tell any condensation milked the oil but never done a UOA. No milky under the fill cap.
I guess I'll continue once a year oil change for her until any visual sign says otherwise. I do 5k myself and that happens average every 2-1/2 months.

Back in the day (military) we used to drip some oil off the dipstick onto foil. Then moved a lighter flame under it.
If it smoked before it crackles the oil, all good. If it crackles before smoke, assume some condensation.
Spit in it and check again he says eek



Last edited by Errtt; 02/02/18 07:11 PM.
Re: About oil change once a year [Re: Vladiator] #4654247
02/02/18 07:56 PM
02/02/18 07:56 PM
Joined: May 2013
Posts: 681
Florida
SilverSnake Offline
SilverSnake  Offline
Joined: May 2013
Posts: 681
Florida
Originally Posted By: Vlad_the_Russian
So this is a bit extreme, but... here is what happens to oil when it sits in the engine for too long, regardless of miles. Steady diet of Castrol Edge, but for 5+ years engine was just sitting. Engine is in good condition, for a 1990s BMW at least. But oil pan and oil filter cup are filled with this gunk because the oil was just sitting there, and over time oil lost its properties. None of this is present anywhere else, but the pan and oil filter cup.


Yeah but just look at all the money the owner saved on oil changes.


2016 Charger, 6.4L-485 HP (PUP 0W-40)
2017 BMW 330i, 2L-248 HP (BMW 0W-20)
2018 Jeep GC, 5.7L-360 HP (PP 5W-20)
2008 20KW Generac (Amsoil 10W-30/30)
Re: About oil change once a year [Re: Boomerang] #4654292
02/02/18 08:47 PM
02/02/18 08:47 PM
Joined: Sep 2015
Posts: 6,090
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 6,090
Kalifornia Kollective
OK, TX weather is somewhat like Cali weather. Winters are mild and heat is the big issue. I've run premium oils in seldom driven trucks for 5 years at a whack. All fine. Never had that kind of gunk as shown above. Pulled valve covers to replace leaky gaskets, clean as a pin.

Run it as long as you are comfortable and then send a sample. You'll know. Then base your change schedule on that smile


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: About oil change once a year [Re: Vladiator] #4654337
02/02/18 09:42 PM
02/02/18 09:42 PM
Joined: Oct 2012
Posts: 4,825
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,825
Taiwan
Time is a key ingredient in a good curry, but I'd bet it isn't the only key ingredient in that Russian chocolate milk shake. Something else going on there.

If I had to guess, I'd guess glycol contamination of the oil prior to being parked up.

Last edited by Ducked; 02/02/18 09:46 PM.
Re: About oil change once a year [Re: Ducked] #4654343
02/02/18 09:45 PM
02/02/18 09:45 PM
Joined: Apr 2008
Posts: 37,978
Ontario, Canada
OVERKILL Offline
OVERKILL  Offline
Joined: Apr 2008
Posts: 37,978
Ontario, Canada
Originally Posted By: Ducked
Time is a key ingredient in a good curry, but I'd bet it isn't the only key ingredient in that Russian chocolate milk shake. Something else going on there.


I agree. I left the oil in a few SBF's for at least that long, never got that as a result.


2018 RAM 1500 Big Horn EcoDiesel
2016 Grand Cherokee SRT
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