[ddeflyer]

Originally Posted by jvincent

Sorry for the slight off topic here.

I've been struggling with the validity of data from a UOA for the track. As I understand the process, they measure for wear metals and the current viscosity. I don't believe they address viscosity at high temps. So, while a really bad number can be a sign of wear, it's probably too late at that point and a "good" wear report may not be indicative of degraded high-temp viscosity, which is what we care about.

Personally I'd rather change the oil more frequently, a change only costs me ~$60, for the peace of mind.

They test the viscosity at a standardized temperature. In my case I am running the JR oil cooler so I am not seeing as high of temperatures. I am also running 300V 0w20 which is probably going to be a bit more stable than other 0w20s against abusive conditions. It is also thick oil in the 0w20 spectrum.

Also, changing oil really frequently (like if you were doing it once a month) carries its own set of risks. Every time you change oil you are changing the specific nature of what is running through the engine. A fresh load of oil is going to be undergoing a set of initial changes, among them is some initial shear and some chemical changes. These variations are not the easiest thing on the motor compared to a steady state healthy oil (not that it is actually that hard on the engine, but still...). Beyond the fact that you are exposing your car to more chances of a loose drain plug or what not,

In the end though, you have to decide what is best for you, your car and your wallet. Just be aware that while the manual calls for energy conserving oil, that oil is at the very thin end of the 0w20 spectrum.