Quote:
Originally Posted by terboboost
Just because 275-300 is maybe ok doesn't mean it is ideal. Your oil WILL start breaking down at those temperatures. How about running that known-good synthetic 30- or 40- weight, with a simple air to oil cooler at 200-230 temps for maximum reliability?
|
I had oil analysis done with 4400 miles and 6 track days (with ~270F oil temps) on the oil (at 7200 total miles after first oil change at 2800 street miles). This was with Subaru 0w20 synthetic. TBN "plenty strong" after that. Per Blackstone: "TBN stands for Total Base Number and measures the amount of active additive present in the oil. It’s a good test if you want to run your oil longer than you normally do."
cSt at 100C is a bit thin though. FWIW I asked for 5w30 and Subie service desk guy said "no prob", but after I got this report I went back and looked at the invoice and it listed 0w20, in retrospect not surprising the techs put in the oil Subaru dictates...