For those that advocate 10K miles OCI

tolian21 said:
This looks nice indeed! I know what he will say: “but my engine runs/ran fine and I saved a lot of $$$”
Click to expand...


It probably does run fine and I would leave it at that.

There are way too many variables for engines to develop varnish. It is not as simple as more frequent oil changes to avoid it. There are examples here of people doing 3k OCI and having varnish inside the engine.
 
tolian21 said:
This looks nice indeed! I know what he will say: “but my engine runs/ran fine and I saved a lot of $$$”
Click to expand...
Exactly this. These engines are known for sludging so for a car that always had manufacturer OCI's i am happy with the results.

I call this a concerning amount of sludge/varnish, but even engines like this useally get to high milage without problems as long as you dont start prying it off and clogging up the oil pickup filter.
1645977666203.webp
 
tolian21 said:
This is just a simple view. 10k OCI is not a one size fit all solution, there are specific engines and driving conditions that need to be accounted for.
Click to expand...
Of course not. Manufacturer has been setting OCI per engine / vehicle just like the weight. There are still vehicles out there having 7.5K OCI with 5w30, and for those who aren't in these special cases (i.e. high performance sports car or turbo SUVs with small engines), many are doing 10K OCI with no problem for 200K (they may have other problems like intake deposit but not oil slugging up).
 
PandaBear said:
many are doing 10K OCI with no problem for 200K
Click to expand...

All just generalities.
1. “No problem” does not mean their engine is in top shape at 200k.
2. Individual experiences, type or engine and type of driving play a role.

10k OCI works for some, in fact for certain driving and type of engine you can do 15-20k.
 
tolian21 said:
All just generalities.
1. “No problem” does not mean their engine is in top shape at 200k.
2. Individual experiences, type or engine and type of driving play a role.

10k OCI works for some, in fact for certain driving and type of engine you can do 15-20k.
Click to expand...
Exactly - look how many years for Tig and his port Injection engines - our 2014 Fusion was an easy ”decide” to go 10k … but my current engines and driving patterns - not so much …
 
I just don't get it. I've had vehicles that got oil changes from 2,000 mi to 60,000 mi. None of them ever died from an oil related failure. It's about what the specific application needs.
 
Gene K said:
I just don't get it. I've had vehicles that got oil changes from 2,000 mi to 60,000 mi. None of them ever died from an oil related failure. It's about what the specific application needs.
Click to expand...
What kind of vehicle were you doing 60k oil change intervals on with no ill effects???

I thought even OTR trucks maxed at like 30k intervals on full synthetic and a 20 gallon capacity. I am NOT very familiar with maintenance for that industry though.
 
Last edited:
tolian21 said:
This is just a simple view. 10k OCI is not a one size fit all solution, there are specific engines and driving conditions that need to be accounted for.
Click to expand...
Friend of mine has a 17 CR-V 1.5T with 85k+ miles. I have done every oil service with M1 EP or AP 0W-20. Her service intervals are 10-11K per the OLM.

I did a UOA out of curiosity and the fuel dilution is high, as expected. It is running the latest calibration. Engine still runs fine though.
 
The Critic said:
Friend of mine has a 17 CR-V 1.5T with 85k+ miles. I have done every oil service with M1 EP or AP 0W-20. Her service intervals are 10-11K per the OLM.

I did a UOA out of curiosity and the fuel dilution is high, as expected. It is running the latest calibration. Engine still runs fine though.
Click to expand...
If there's some percentage of fuel in the oil, isn't the lubricating ability of the oil compromised? Doesn't the fuel act as a solvent regardless of the oil's viscosity, HT/HS, or approvals? Is there really any acceptable (perhaps that's subjective?) level of fuel in the oil, especially long-term? At what point, both in percentage and with time, is fuel dilution a serious concern as opposed to something that can be lived with (there's that "acceptable level" again)?

Some say to take the car out for a long drive to "burn off" the fuel and contaminants, but then the fuel starts building up again between those long runs. How often does the car need to be run to keep dilution to an acceptable;e level?
 
Shel_B said:
If there's some percentage of fuel in the oil, isn't the lubricating ability of the oil compromised? Doesn't the fuel act as a solvent regardless of the oil's viscosity, HT/HS, or approvals? Is there really any acceptable (perhaps that's subjective?) level of fuel in the oil, especially long-term? At what point, both in percentage and with time, is fuel dilution a serious concern as opposed to something that can be lived with (there's that "acceptable level" again)?

Some say to take the car out for a long drive to "burn off" the fuel and contaminants, but then the fuel starts building up again between those long runs. How often does the car need to be run to keep dilution to an acceptable;e level?
Click to expand...
https://bobistheoilguy.com/forums/threads/2017-honda-cr-v-1-5t-mobil-1-ep-0w-20-10-188-mi.290778/
https://bobistheoilguy.com/forums/threads/2017-honda-crv-1-5t-mobil-1-ep-0w-20-8-731-miles.311499/

The car sees 300-400 miles of highway driving each week. Clearly, this is not enough to keep the fuel dilution under control.
 
First time I can ever recall someone saying that changing a fluid "too early" is BAD for your vehicle.

In this case Toyota's Transmission Fluid at other than 60K miles or more. Author's theory is that you need the bits of
clutch debris floating around to help your transmission shift without slipping is a necessity. Change it too early and you
don't have enough "helpful" debris available to shift those clutches, hence more slippage, and then an earlier end of life on the trans.
This is independent of the car's mileage. Really???

So my 2001 Lincoln Continental (FWD) is known for having an under-powered "6 cyl Taurus trans" (AX4N) that do tend to
fail somewhat early on. Factory recommended fluid changes are at 30K which is probably fine for highway cruising. I had a highway cruise Lincoln AX4N that I changed every 25K miles and took it well over 200K miles before the engine died. But, what about cars doing mainly
shorter trips and stop and go around town, frequent auto transmission shifting..... that is much more severe service on a transmission? Per the author, changing the fluid early at say 15K to 20K that would be significantly shortening Lincoln AX4N transmission life.

That's a new take on trans fluid theory that I've never heard before. So here I was planning on doing my next trans fluid change at 20K miles
to avoid any risk of overly oxidized trans fluid......and now it's supposedly the wrong thing to do?
 
Last edited:
Baracoa said:
What about Extended Performance oils such as Mobil 1 EP and Castrol Edge EP that claim to be good for 20,000 miles? Should those also be changed at 5,000 miles if vehicle is driven mainly in city, short trips, stop and go traffic, etc.?
Click to expand...
Maybe..I would do an uoa after 5-6k and decide after that.
 
You must log in or register to reply here.

Similar threads

cammyfive79
K24 and 10k OCIs
3 4 5
Replies
94
Views
5K
Revving2Redline
cammyfive79
2014 TSX K24 + HPL Euro 5W30 = safe for 10K mile OCI right off the bat?
Replies
10
Views
502
Titan
D
beardedfordtech Ford 3.7 V6 10K OCI WITH AMSOIL
Replies
6
Views
738
spj
The Critic
Honda K24 Valvetrain, 135K miles
2 3 4
Replies
73
Views
3K
Bullwinkle007
O
10k OCI oil recommendation for 3800?
Replies
12
Views
959
slacktide_bitog
Back
Top Bottom