ChiDiddy

running a blower does not change any of the bearing clearances or anything specific to the internals. in no way does that warranty running a high viscosity oil. no need to run 10w-30. thicker for cold startup, and thicker than 20 after its warmed. run 5w-20, at most, 5w-30.

Cubs17

I just do what the manual says, like everyone else said....can't go wrong.

FlyGuy06

thanks for the quick reply's everyone. I took the car back today and put Valvoline SynPower 5w-20 in and she runs much better.

MustangBatman1

good to hear you fixed that problem, did they charge you to change the oil again?

Blackhawk

Under forced induction almost everybody runs a thicker oil or at least a higher temp rating. Under higher pressure and extreme temps, that's just the way it is. Maybe 5W30 is all that's recommended so that there is a little extra when it's hot? But it's kind of like running 1 step colder plugs. Doesn't say in the manual that you should run colder plugs in the car if you supercharge or turbocharge the car either.