Ok yeah, I was thinking of the Euro FS version. I'd probably still be ok with it myself but I wouldn't use it more than a track day. The higher HTHS stuff i'd probably be comfortable using two or three times.
Originally Posted by oil_film_movies
Agreed, except M1 dexos1 5w30 is at a "low" 3.1. Its high enough for a lot of driving sytles though. Corvettes: 1. Boulevard cruiser, commuter usage: M1 0w30, M1 5w30 or M1 10w30 HTHS ~3.0 2. Occasional track usage, sustained high speeds under 5 minutes: M1 ESP 5w30 or ESP 0w40, HTHS ~3.5 3. Racing, sustained high speeds over 10 minutes, like a day at Willow Springs in July: M1 5w50, M1 15w50, or Ravenol RUP 5w40, HTHS 3.9 to 4.5 is plenty. A similar set of rules can be set up for those BMWs that use LL-01FE HTHS ~3.0 oil for everyday (rule 1) use. Basically any engine whose Owner's Manual says HTHS about 3.0 is fine can use these rules. Cold climates, winter starts, may want to bias toward using 0w30 and 0w40, when below 0F.
Originally Posted by Jimmy_Russells
The regular Mobil they spec will be fine for oil temps up to about 240-250. More than that I'd probably go into a 5w40 racing oil like several mentioned thus far which will bump HTHS up to about 4 from 3.5