Royal Purple ?

[Quick]

Seeing the guys from "Hot Rod TV" are always using this product, I decided to take the plunge.

I know the 5-30 & the 10-30 are thinner than the 20-50. Is it better protection to run the higher numbered oil?

I always thought that the 20-50 was for high perf. engines.

[Chris 96 WS6]

The first number is the cold performance number. If you live where it gets really cold, 20w-50 is not a real good idea. I like a 10w-40 personally, just as an all around oil. I have used the Mobil 1 15w-50 and most recently Royal Purple 10w-40, which I really liked.