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#4605343 - 12/16/17 12:25 PM why extended OCI ?
BalticBob Offline


Registered: 11/27/16
Posts: 395
Loc: 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 !

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#4605351 - 12/16/17 12:35 PM Re: why extended OCI ? [Re: BalticBob]
Rolla07 Offline


Registered: 11/05/11
Posts: 4737
Loc: 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.
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#4605352 - 12/16/17 12:39 PM Re: why extended OCI ? [Re: BalticBob]
RedOakRanch Offline


Registered: 11/10/13
Posts: 846
Loc: 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.
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1994 Ford Crown Vic 206k-Frankenbrew 0w20,30,40!
2005 Chevy 1500 Crewcab 4X4 178k-BC 0w30 $2/qt
2016 Outback 2.5 Limited 56k-M1 EP 0w20 $2/qt

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#4605353 - 12/16/17 12:41 PM Re: why extended OCI ? [Re: BalticBob]
simple_gifts Offline


Registered: 07/26/04
Posts: 11945
Loc: 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?


Edited by simple_gifts (12/16/17 12:42 PM)
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2004 Prius; 92K ML Syn 5W-30
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#4605354 - 12/16/17 12:42 PM Re: why extended OCI ? [Re: BalticBob]
BigCahuna Offline


Registered: 09/29/09
Posts: 2141
Loc: 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.,,,

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#4605357 - 12/16/17 12:44 PM Re: why extended OCI ? [Re: simple_gifts]
jdavis Offline


Registered: 12/22/05
Posts: 675
Loc: 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..

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#4605381 - 12/16/17 01:06 PM Re: why extended OCI ? [Re: simple_gifts]
JohnnyJohnson Online   content


Registered: 10/22/09
Posts: 2754
Loc: 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


Edited by JohnnyJohnson (12/16/17 01:09 PM)
_________________________
2004 Toyota Corolla 121758
Out: QSUD 5W-30 Purolator One 5030
In: Valvoline ML 5w-30 TG4967 117530 2-8-18
2006 Duramax 74047
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 73752 4-22-18

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#4605396 - 12/16/17 01:21 PM Re: why extended OCI ? [Re: BalticBob]
aquariuscsm Online   content


Registered: 12/30/06
Posts: 18173
Loc: Dallas,Tx USA
I'm compulsive with my cars. 3/3K like clockwork.
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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
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#4605405 - 12/16/17 01:30 PM Re: why extended OCI ? [Re: BalticBob]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: 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.

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#4605408 - 12/16/17 01:31 PM Re: why extended OCI ? [Re: BalticBob]
BalticBob Offline


Registered: 11/27/16
Posts: 395
Loc: 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!

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#4605419 - 12/16/17 01:42 PM Re: why extended OCI ? [Re: BalticBob]
oliveoil Offline


Registered: 12/12/06
Posts: 417
Loc: snow and sun
Convenience.

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#4605420 - 12/16/17 01:48 PM Re: why extended OCI ? [Re: BalticBob]
Donald Offline


Registered: 03/21/04
Posts: 20461
Loc: 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.
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2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)


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#4605423 - 12/16/17 01:52 PM Re: why extended OCI ? [Re: Merkava_4]
Wolf359 Online   content


Registered: 04/27/12
Posts: 4756
Loc: 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.

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#4605424 - 12/16/17 01:52 PM Re: why extended OCI ? [Re: BalticBob]
Kira Offline


Registered: 08/19/10
Posts: 5250
Loc: 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.

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#4605425 - 12/16/17 01:55 PM Re: why extended OCI ? [Re: Donald]
2015_PSD Online   content


Registered: 09/26/10
Posts: 7237
Loc: 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 - M1 0W-40/OEM
2018 MB C300 2.0L - M1 0W-40/OEM
2015 F-250 6.7L PS Diesel - Delo 5W-40/CQ Blue
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