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#4533677 - 10/04/17 10:54 AM Dead Horse Warning: What's with the short OCI's?
homeyclaus Offline


Registered: 08/22/11
Posts: 99
Loc: Northern VA
So let me start another thread on this. It's now 2017. Newer cars have oil life monitors. Yet I see late model cars in the UOA section with 5000 mile or less OCIs, with great results and lots of life left on the oil. Why? I mean it's better than 3000 mile OCI's, since we're not in the 70's anymore, but 7500 mi OCIs have been the norm for Japanese designs for over 15 years now.
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2013 Toyota Tundra CM 5.7L TRD (M1 0w20/PUP0w40euro, WIX/CQ filter)
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#4533680 - 10/04/17 10:56 AM Re: Dead Horse Warning: What's with the short OCI's? [Re: homeyclaus]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35976
Loc: Great Lakes
Severe service?
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'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
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#4533681 - 10/04/17 11:00 AM Re: Dead Horse Warning: What's with the short OCI's? [Re: homeyclaus]
LeakySeals Offline


Registered: 02/18/11
Posts: 6625
Loc: Hudson, NH
Those that find it necessary to perform a UOA on a late model car are likely change their oil prematurely. Which is what you're seeing.
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#4533682 - 10/04/17 11:00 AM Re: Dead Horse Warning: What's with the short OCI's? [Re: homeyclaus]
wemay Offline


Registered: 04/04/12
Posts: 9002
Loc: Southeast Florida
Direct Injection
Direct Injection Turbo

may cause...

Fuel Dilution (shearing)
Rapid oil breakdown
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#4533684 - 10/04/17 11:01 AM Re: Dead Horse Warning: What's with the short OCI's? [Re: homeyclaus]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
Obsessive Compulsive Disorder....

Like the people that can't touch a door handle without a Kleenex
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#4533686 - 10/04/17 11:05 AM Re: Dead Horse Warning: What's with the short OCI's? [Re: homeyclaus]
Leo99 Offline


Registered: 03/30/14
Posts: 3118
Loc: NJ
Like people that don't believe in lifetime fluids. They just don't believe oil can go 10,000 miles. They weren't raised that way.
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#4533692 - 10/04/17 11:10 AM Re: Dead Horse Warning: What's with the short OCI's? [Re: wemay]
jeepman3071 Offline


Registered: 04/15/10
Posts: 4316
Loc: Storrs, Connecticut
Originally Posted By: wemay
Direct Injection
Direct Injection Turbo

may cause...

Fuel Dilution (shearing)
Rapid oil breakdown


This and engines are getting more expensive.

My GF's BMW specifies 10-15k mile oil changes. Swapping in an engine if hers fails would cost north of $8,000. Pretty much just scrap the car at that point since it is a 2006. It is easy to think 5,000 miles would be safer, even though in reality the oil is probably just fine for 10,000 miles.

For OCD people, it is easy to get worried about having the best oil in the engine possible when engines are so complicated and expensive. These aren't 350 Chevys anymore where you can buy a crate engine for $2000 and swap it in a weekend.
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#4533696 - 10/04/17 11:13 AM Re: Dead Horse Warning: What's with the short OCI's? [Re: homeyclaus]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 12037
Loc: N.H, U.S.A.
My rogue OM says 6 Mo or 6 K mi or risk no warranty if engine lunches and oil is toast.
Oh, wait! Nissan doesn't want myservice mgr to make a warraty claim so - forget what I just said.
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#4533697 - 10/04/17 11:14 AM Re: Dead Horse Warning: What's with the short OCI's? [Re: homeyclaus]
bigj_16 Offline


Registered: 07/03/17
Posts: 1291
Loc: Douglas County, Colorado
I can only speak for myself. When I see fuel dilution and viscosity out of grade, I will happily change my oil.

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#4533704 - 10/04/17 11:17 AM Re: Dead Horse Warning: What's with the short OCI's? [Re: homeyclaus]
i_hate_autofraud Offline


Registered: 05/19/16
Posts: 714
Loc: Canada


We've been brainwashed with scare tactics by oil companies for generations!

The biggest risk to late model engines is not the oil OCI, but owners who don't lift the hood and check the oil level
and run engines till the oil light comes on with 1 qt in the pan then complain their engine is blown! Jeez!

Any of the thousands of tests show you have to run way over a long OCI to get to a TBN of 1.0 or less!

I know if I go on a all day 500 mile hiway run 60 MPH or more, I'll bring some oil to top up, I'll be about a 1/2 qrt low!

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#4533706 - 10/04/17 11:20 AM Re: Dead Horse Warning: What's with the short OCI's? [Re: homeyclaus]
Virtus_Probi Offline


Registered: 06/25/15
Posts: 4068
Loc: New England
My 2014 Subaru specified 7500 OCIs for non-severe service, but the next model year (2015) it was changed to 6000 miles without any obvious changes having been made to the engine. This may have been a blanket change due to ongoing oil consumption problems with other Subaru engines, but I also wondered if the DITs were just chewing up oil faster than expected. No OLM in my vehicle, either.
I stick with 5000 mile OCIs because it's easy to remember and I like having just a bit more margin.
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#4533712 - 10/04/17 11:24 AM Re: Dead Horse Warning: What's with the short OCI's? [Re: homeyclaus]
oldhp Offline


Registered: 06/28/12
Posts: 1658
Loc: USA
The "oil" can go 10K miles, but it gets full of crud. That's why people change it out. My 2012 Equinox 2.4 gets the oil changed every 2000 miles or 3 months. The really black, doesn't look or smell like oil stuff that comes out needs changed. I don't need to see a UOA to tell me what I hear, see and smell. At close to the 2K/3 mo the VVT valve train starts to get noticeably louder. This car sees 15 to 30 starts a day, at least. It's Direct Injection. GM backed the OCI up because of timing chain failures, because of dirty diluted oil. That's my reasoning for "this" car.....and a good friend tech who works at a local Chevy dealership agrees. Cheers2


Edited by oldhp (10/04/17 11:25 AM)
Edit Reason: add'n
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#4533718 - 10/04/17 11:26 AM Re: Dead Horse Warning: What's with the short OCI's? [Re: homeyclaus]
OTCW Offline


Registered: 05/07/17
Posts: 49
Loc: Tennessee
My 2017 Nissan specifies 5,000 miles or 6 months.
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2017 Nissan Sentra 1.8L 11k miles
2004 Nissan Frontier 2.4 L 199k miles
2012 Yard Machines 21 in 140 cc
2001 Weedeater Featherlite Plus 21 cc

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#4533725 - 10/04/17 11:30 AM Re: Dead Horse Warning: What's with the short OCI's? [Re: homeyclaus]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
They're trying to avoid the formation of varnish.

Nobody wants stir-fry pan stains on the inside of their engine.

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#4533738 - 10/04/17 11:39 AM Re: Dead Horse Warning: What's with the short OCI's? [Re: homeyclaus]
Vuflanovsky Offline


Registered: 12/15/14
Posts: 1196
Loc: California
If you own one, I wouldn't recommend blind 10K mile OCIs with a GDI or TGDI as they may require a little more vigilance. I can see 5K mile OCIs as standard for these engines so "short OCIs" is a relative term and not an absolute one. It's definitely a dead horse response if someone just thinks of the oil and not the application when they recommend long OCIs.

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