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Originally Posted By: Solo2driver If you're already running a well-recommended oil, there is not much else to do but pull a Used Oil Analysis sample to ensure that the oil is doing its job, much else is just guessing and conjecture. Love the MS3, BTW, I get to autocross one that is not mine...

Originally Posted By: mechtech2 Do you have an oi temp gauge? Max temps are what you need to know. But right now, a full x-40 or x-50 seems very close. Unfortunately there is not an oil temp sensor on this car! I will have to add one eventually. What do you mean by x-40, x-50? Synthetic 40...

I drive my Mazdaspeed3 fairly hard. I also take it to track events occasionally. I've read there can be fuel dilution concerns with this engine. Is Rotella 5w40 ok for this application? That is currently in the car, but I have a track weekend coming up and am worried about that being the wrong...