2022 Corolla Cross HPL PP 0W-8 30k mi OCI

[The Critic]

There’s no real downside (other than a slight possible change to mpg) in this case, since the engine is recommended to use Xw20 anyways. Everything else is stellar for the mileage. 30k is not doing any disservice to the OP’s engine.

Fuel economy impact could be significant if it was a short-tripped hybrid, but not for the OP's application.

 

[Oliveoil2]

How is this car being driven??

 

[himemsys]

I've never seen Boron *increase* on a report like this. This leads me to believe there was *some* make up oil added. How much?

 

[RDY4WAR]

I've never seen Boron *increase* on a report like this. This leads me to believe there was *some* make up oil added. How much?

The boron went up slightly OCI over OCI. Each report there is a different oil change, not multiple reports from the same oil. Slight change to formula batch over batch.

 

[SubieRubyRoo]

How is this car being driven??

All the time

 

[930.engineering]

With the viscosity @ 100C being 8.39, doesn't that make this oil basically a Xw-20? I've seen less viscous numbers on reports with Xw-20 oils.

Exactly. XW-20 ranges from 5.6 to Si at 35 ppm (34-39 per OCI), probably a non-issue,
but I'd check air filter and its seal and fitment anyway.
.

 

[SubieRubyRoo]

Fuel economy impact could be significant if it was a short-tripped hybrid, but not for the OP's application.

After I thought about this some more, I have to ask: how could fuel economy impact be significant if the engine is recommended to use a 20wt oil from the factory? Basically, OP would be “back to” the expected viscosity, and therefore should deliver fuel economy in line with a conventionally-operated (I.e., engine with 20wt all the time).

In obverse terms, @Direct_Rejection has reaped the benefit of lower viscosity and higher MPG for 30k miles and zero trips under the vehicle, and is finally now back on equal playing grounds with the OEM….

 

[The Critic]

After I thought about this some more, I have to ask: how could fuel economy impact be significant if the engine is recommended to use a 20wt oil from the factory? Basically, OP would be “back to” the expected viscosity, and therefore should deliver fuel economy in line with a conventionally-operated (I.e., engine with 20wt all the time).

In relative terms - 0W-8 vs. a used oil that is closer to a 20wt.

It is also unclear if the Viscosity Index and Cold Temp Viscosities will still fit the profile of a typical 0W-20....not quite sure how the aging process affects viscosity at every temperature.

 

[TiGeo]

HPL oils, at least the Euro 40, has a VOA Si of ~10. Keep that in mind.

 

[himemsys]

The boron went up slightly OCI over OCI. Each report there is a different oil change, not multiple reports from the same oil. Slight change to formula batch over batch.

Wait. What? The OCI says 30k miles. The assumption was it is being sampled at longer and longer intervals, not being changed between each interval.

 

[SubieRubyRoo]

In relative terms - 0W-8 vs. a used oil that is closer to a 20wt.

It is also unclear if the Viscosity Index and Cold Temp Viscosities will still fit the profile of a typical 0W-20....not quite sure how the aging process affects viscosity at every temperature.

Agree, there are still unanswered questions when we get to extremes like 30k OCIs; maybe David can share some info.

 

[SubieRubyRoo]

Wait. What? The OCI says 30k miles. The assumption was it is being sampled at longer and longer intervals, not being changed between each interval.

Negative; last report was 20k mi @59k total; this report was 30k @ 89k total miles.

 

[PimTac]

Exactly. XW-20 ranges from 5.6 to Si at 35 ppm (34-39 per OCI), probably a non-issue,
but I'd check air filter and its seal and fitment anyway.
.

Good point and especially if the OP has driven through wildfire smoke which is prevalent this time of year.

 

[We're Metals]

Did anybody ever say what oil filter is being used?

 

[fantastic]

There’s no real downside (other than a slight possible change to mpg) in this case, since the engine is recommended to use Xw20 anyways. Everything else is stellar for the mileage. 30k is not doing any disservice to the OP’s engine.

I definitely can't complain about the wear numbers. There's really no oil analysis PPM limits on a Honda or a Toyota. So, here goes my blackstone comment "Try 50,000 miles next time" .

 

[doublebase]

Remember you have to start with baseline numbers, which we don't have. Take a look at my UOAs where I have normalized the oxidation values, you'll see the the absolute oxidation is not the real oxidation number.

https://bobistheoilguy.com/forums/t...-20-12-000-miles-on-oil-152-000-total.368107/

Gotcha, but I didn’t consider where it began, I just observed the limits, and that it exceeded the limits in oxidation, sulfation and nitration. Are those three, factors in sludge and varnish formation?

 

[simple_gifts]

Isn't this the point where someone needs to post the "don't run your toyota to 10K miles' youtube video? j/k

Awesome run.

 

[ARB1977]

**** that’s impressive. I may jump on the HPL wagon.

 

[spasm3]

It was just a year ago to the day when we gathered in Manteno.

It was great to meet you! Thanks for posting an amazing uoa.

 

[wwillson]

Gotcha, but I didn’t consider where it began, I just observed the limits, and that it exceeded the limits in oxidation, sulfation and nitration.

No, the oxidation limit in this oil has not been reached. The HDEO in my Durango has a virgin oxidation value of about 40. Since HPL's base oils are high in carbonyl groups, ASTM D7414 will show high oxidation even in virgin oil. Let's say the virgin oxidation value of this oil is 40 and after 30k miles the oxidation is 56.3, then the real oxidation value after 30k miles is 16.3, which is lower than Wearcheck's suggested condemnation value of >25.

My point is the absolute oxidation value on the UOA is useless unless you normalize the value with the known virgin oxidation number.