Sorry to dredge up this old thread again, guys; but my search didn't give me exactly what I was seeking.
Coming up on the 7500 miles. I'm going to switch over to Mobil 1.
Here's my question. Which viscosity ? 5w30 seems to be standard, but the manual gives other grades which can be used for high temperatures, extreme conditions. I've heard others who recommend 15w50 for a turbo.
Most of my driving is a long freeway commute But I do engage in some spirited backroads driving on the weekends and I have a track day coming up at Thunderhill next week. I expect it'll be hot and I'll be working the car hard with plenty of high RPM running. Would something like 10w40 be a reasonable compromise or am I fine sticking with 5w30 ?