0W-40

[flyinlow]

I see Mobil 1 is available in 0W-40 weight. That would help lube on cold starts. Anyone running it in older design engines inplace of 10W-40?

  I have had good luck with their 5w-30 oil in our normal cars and I run 15W-50 in the 440 with Comp cams additive.

[John_Kunkel]

I'm of the opinion that the zero weight oils were developed to manipulate CAFE numbers (and for the newer MDS), I'd never use them in an older car.

[1969chargerrtse]

Yeah, I always use 20/50 myself. Nice oil pressure. 

[moparstuart]

Yeah, I always use 20/50 myself. Nice oil pressure. 

  20/50  valvaline racing formula with zinc

[1969chargerrtse]

Yeah, I always use 20/50 myself. Nice oil pressure. 

  20/50  valvaline racing formula with zinc

ZR1 Yep, da best. 

[randr]

only oil and filter i will use!

[Rolling_Thunder]

I run 0w-40 Mobil 1 in my 6.1 Hemi -