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why extended OCI ? #4605343
12/16/17 01:25 PM
12/16/17 01:25 PM
Joined: Nov 2016
Posts: 395
Texas
BalticBob Offline OP
BalticBob  Offline OP
Joined: Nov 2016
Posts: 395
Texas
Why do some car owners try to get the last mile out of a oil change?
Compared to engine damage from dirty oil, they are not that costly.
Even a low price oil and filter changed at 5-8K is better than extending any oil/filter combination. The whole point of a oil change is to get the dirty oil out and clean oil in, right?

I agree with the UOA group, that is the only way to know when oil needs to be replaced.
That mileage is different for every car (even if the same model), because of different driving habits, etc.

Even with a UOA at a high mile interval, it would be better to put the UOA cost into a fresh oil change.
When in doubt, change it out.

Now I wait for the posts to correct my skewed reasoning !

Re: why extended OCI ? [Re: BalticBob] #4605351
12/16/17 01:35 PM
12/16/17 01:35 PM
Joined: Nov 2011
Posts: 4,857
MTL, CANADA
Rolla07 Offline
Rolla07  Offline
Joined: Nov 2011
Posts: 4,857
MTL, CANADA
Everyone has their own opinion on this matter. Nothing wrong with extending an interval if its safe to do so. Some use a UOA as a baseline to know how far they can safely extend an oil change. Once done you can follow it for life of the vehicle. If you can get 12k instead of 6k on ur oil, whats wrong with that? I dont do it personally but thats cuz i get bored.


2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967

Re: why extended OCI ? [Re: BalticBob] #4605352
12/16/17 01:39 PM
12/16/17 01:39 PM
Joined: Nov 2013
Posts: 867
Central Coast California
RedOakRanch Offline
RedOakRanch  Offline
Joined: Nov 2013
Posts: 867
Central Coast California
It's all relative. My UOA's at 10k and 15k mile intervals have showed the oil had plenty of life left. I consider under 10k short, 10-15k normal. I would only consider over 15k extended. Under 5k in my experience is straight up throwing away money, track use or other special use exempted of course.


1994 Ford Crown Vic 207k-Frankenbrew 0w20,30,40!
2005 Chevy 1500 Crewcab 4X4 180k-BC 0w30 $2/qt
2016 Outback 2.5 Limited 60k-shop brand?
Re: why extended OCI ? [Re: BalticBob] #4605353
12/16/17 01:41 PM
12/16/17 01:41 PM
Joined: Jul 2004
Posts: 12,031
Middlesex County CT
simple_gifts Offline
simple_gifts  Offline
Joined: Jul 2004
Posts: 12,031
Middlesex County CT
I do extended OCI since it prevents me from having to roll under the car on a snow covered gravel driveway in Jan-Feb @ 20F

Why do it if I don't have to?

Last edited by simple_gifts; 12/16/17 01:42 PM.

2004 Prius; 97K ML Syn 5W-30
2007 Yaris 71K 0w-40 Castrol
2006 B2300;130K;ALM


Was driving an ox cart; Now on the USS Enterprise
Re: why extended OCI ? [Re: BalticBob] #4605354
12/16/17 01:42 PM
12/16/17 01:42 PM
Joined: Sep 2009
Posts: 2,160
Deep in the heart of Jersey
BigCahuna Offline
BigCahuna  Offline
Joined: Sep 2009
Posts: 2,160
Deep in the heart of Jersey
My car is a vehicle I bought to serve me. I only change my oil between 1 -1 1/2 years, because the oil I buy can do it without allowing my motor to wear itself out. Besides, I'm tired of changing oil and yes my method works. '02 Ford Explorer with mobil 1 ex performance oil and a Booch filter. Just turned over 200k . If changing your oil alot, and having to do something with the used oil and filters is your thing, go for it. I do agree that paying money for a UOA, is money better spent on new oil and filter, then continuous opinions about the condition of your oil or motor. If they say your motor is shot because of whats floating in your oil, your still gonna have to spend more money beside the UOA to either fix it or replace it. If they could tell you exactly the minute it will fail, that might be worth it.,,,

Re: why extended OCI ? [Re: simple_gifts] #4605357
12/16/17 01:44 PM
12/16/17 01:44 PM
Joined: Dec 2005
Posts: 677
New England
jdavis Offline
jdavis  Offline
Joined: Dec 2005
Posts: 677
New England
Originally Posted By: simple_gifts
I do extended OCI since it prevents me from having to roll under the car on a snow covered gravel driveway in Jan-Feb @ 20F

Why do it if I don't have to?


This..

Also, some people maintain 3-4 cars, do you want to be changing oil every 5k on 4 cars?

Also, less wasteful to extend OCI's..

Re: why extended OCI ? [Re: simple_gifts] #4605381
12/16/17 02:06 PM
12/16/17 02:06 PM
Joined: Oct 2009
Posts: 3,222
Wet side WA
JohnnyJohnson Offline
JohnnyJohnson  Offline
Joined: Oct 2009
Posts: 3,222
Wet side WA
Originally Posted By: simple_gifts
I do extended OCI since it prevents me from having to roll under the car on a snow covered gravel driveway in Jan-Feb @ 20F

Why do it if I don't have to?


I realize that planning is very time consuming and stressful. I eliminated that little problem and my OCI's are done in Oct and May. But I know that sometimes we are all rushed and instead of doing a 15 to 20 minute oil change we can drive to the oil store and pay two to three more for a conventional oil change than a full synthetic one. But the trip to the oil store and waiting probably only takes 40 minutes to an hour and your times worth it. crzy

Last edited by JohnnyJohnson; 12/16/17 02:09 PM.

2004 Corolla 124805
Out: VML 5w-30 TG4967 OCI 5007 Miles
In: EDGE EP 5W-30 Bosch 3311 122537 7-18-18
2006 Duramax 74277
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 74705 4-22-18
Re: why extended OCI ? [Re: BalticBob] #4605396
12/16/17 02:21 PM
12/16/17 02:21 PM
Joined: Dec 2006
Posts: 18,634
Dallas,Tx USA
aquariuscsm Offline
aquariuscsm  Offline
Joined: Dec 2006
Posts: 18,634
Dallas,Tx USA
I'm compulsive with my cars. 3/3K like clockwork.


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State Ultimate Durability 5W20

Re: why extended OCI ? [Re: BalticBob] #4605405
12/16/17 02:30 PM
12/16/17 02:30 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
These guys get some kind of macho high by pushing their engine oil to 10,000 miles. It's dumb as heck.

I'd rather take my engine apart someday to find that it's spotless. Much more satisfaction that way.

Re: why extended OCI ? [Re: BalticBob] #4605408
12/16/17 02:31 PM
12/16/17 02:31 PM
Joined: Nov 2016
Posts: 395
Texas
BalticBob Offline OP
BalticBob  Offline OP
Joined: Nov 2016
Posts: 395
Texas
For many of the reasons posted in the replies, I would also like to extend my OCI.
I use full synthetic and Wix filters.
Would a UOA at 8K be a good baseline to start?

Thanks to all!

Re: why extended OCI ? [Re: BalticBob] #4605419
12/16/17 02:42 PM
12/16/17 02:42 PM
Joined: Dec 2006
Posts: 430
snow and sun
oliveoil Offline
oliveoil  Offline
Joined: Dec 2006
Posts: 430
snow and sun
Convenience.

Re: why extended OCI ? [Re: BalticBob] #4605420
12/16/17 02:48 PM
12/16/17 02:48 PM
Joined: Mar 2004
Posts: 20,758
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 20,758
Upstate NY
The OP makes valid points for a car with a 5QT oil sump. Extended OCI and UOAs and bypass filters make sense with diesel truck engines with large oil sumps.

I am sure many huge diesel engines (train, ship) are changed based upon oil analysis.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: why extended OCI ? [Re: Merkava_4] #4605423
12/16/17 02:52 PM
12/16/17 02:52 PM
Joined: Apr 2012
Posts: 5,158
MA
Wolf359 Offline
Wolf359  Offline
Joined: Apr 2012
Posts: 5,158
MA
Originally Posted By: Merkava_4
These guys get some kind of macho high by pushing their engine oil to 10,000 miles. It's dumb as heck.

I'd rather take my engine apart someday to find that it's spotless. Much more satisfaction that way.


Depends on the car. Mercedes specs their cars to 10k as a normal oil change. But they spec synthetic and mine also has an 8.5 quart sump.

Re: why extended OCI ? [Re: BalticBob] #4605424
12/16/17 02:52 PM
12/16/17 02:52 PM
Joined: Aug 2010
Posts: 5,677
Champlain/Hudson Valley
Kira Offline
Kira  Offline
Joined: Aug 2010
Posts: 5,677
Champlain/Hudson Valley
I must jump in with my wrinkle on determining OCI; extended or otherwise.

My EXAMPLE is current.
Since my car was bought used I only know the OC timeline history; nothing about brands used.

My first oil change (Mobil1 0W-40) has been sloppily topped off with anything I had lying around. Additive assessment is impossible.
My 2nd OC is coming up and I have a supply of the same oil. I now can accurately state my "miles on oil" and "amount of top up oil".
Just before my 3rd change I'll be able to sample and see if the factory 7,500 mile OCI is what I need.

ERGO I want the testing lab which does the most complete job. Cheers.

Re: why extended OCI ? [Re: Donald] #4605425
12/16/17 02:55 PM
12/16/17 02:55 PM
Joined: Sep 2010
Posts: 7,560
SE Texas
2015_PSD Offline
2015_PSD  Offline
Joined: Sep 2010
Posts: 7,560
SE Texas
Originally Posted By: Donald
The OP makes valid points for a car with a 5QT oil sump.
Not really. If the oil is still good via UOA, why not extend? Most wear metals are cumulative in nature (meaning you will not reduce them with an early oil change, unless the engine is still breaking in and you desire to get the wear metals out of the engine). In addition, they drop on a per mile basis on extended runs. With modern oils and engines that are more computer controlled than ever it only makes sense to extend the OCI when/where practical.


2018 MB AMG GLC43 3.0L Coupe - Castrol 0W-40/Purflux
2018 MB C300 2.0L - M1 0W-40/OEM
2015 F-250 6.7L PS Diesel - Delo 15W-40/CQ Blue
2014 Explorer 3.5L Limited - M1 AFE 0W-20/FU
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