PP 5w30, 4.0 4Runner (1GRFE), 81,000 Miles

[Dino01]

Here's the sample report for my 4runner. I got trigger happy and decided to send a sample in at only 2,700 to see how things looked, it was my first sample ever after all. Sounds like all is well, I plan on doing 7,500 miles on this oil and OEM filter, then running a sample again.

 

[dave1251]

Go for the 7.5K OCI and resample. Everything will be good.

 

[Benito]

Interesting data point: TBN at 5.0 after 2700 miles on a full syn.

 

[Dino01]

Originally Posted By: Benito
Interesting data point: TBN at 5.0 after 2700 miles on a full syn.
What would one expect to see as the TBN for this mileage on a typical synthetic oil sample? Sorry for my ignorance on that subject of TBN, but from what I've read 5.0 at only 2700 miles seems a bit low?

 

[Ga129]

Here is the Oil stats before use. Compare this to what you have now. http://www.pqiamerica.com/March2013PCMO/pennzoilplt.htm

 

[Danno]

Would the TBN depletion be linear with miles or drop off less rapidly as the miles rack up?

 

[timeau]

Originally Posted By: Benito
Interesting data point: TBN at 5.0 after 2700 miles on a full syn.

This is expected. Popular Russian journal made a test of oil condition with and without flushing. They checked fresh oil properties after 30 minutes of engine run. Results are here, sorry, in Russian only.

Short translation.

Fresh oil TBN: 8.4
Used oil (they will be drained) TBN: 3.2
TBN after "drain-refill" procedure (most popular in the US): 7.3
After Lukoil flushing oil (yes, we use a special flushing oil!) usage: 8.5 (more than original oil)
After flushing oil "Avro" TBN: 8.2
After usual flush: 8.0 and 8.1 (HiGear and AutoDoctor brands)
After long running flush LiquiMoly: 8.0, Suprotec: 8.2