Originally Posted By: Pop_Rivit
Mine cost nothing. When I first joined BITOG I spent some time in the UOA section, and came to two conclusions.
1. The vast majority of the UOAs were just fine, and most could go much further than the 3,000 to 5,000 miles they were running. Getting concerned over 2-3 PPM of anything is just silly, and something that I don't have time for.
2. I realized that the majority of engines are not hard on oil, and the type of driving that I do is even easier on oil. I could save my money and be comfortable with my "twice a year regardless of mileage" oil change interval. I'll let others shell out the money for a UOA; unless I suspect an issue with one of my engines, I'll let others pay for UOAs.
If you go up to once a year up to 20-25k miles oil change interval with quality synthetic oil will you do UOA ?
I did that long OCI in my LS400 with various synthetic oil brands and I didn't do any UOA either. The engine is running well, not as quiet as brand new 22 years ago but as good as 370+k miles can be.