5w30 instead of 5w20 (Synthetic)

[Patman]

Originally Posted By: Torrid
I don't think Mobil 1 5w30 would be a good choice for 30w oils because it is one of the heavier ones at 11cst. I'd probably go with Pennzoil Ultra if you must have a 5w30.


Ultra 5w30 is also a thicker 30wt, all of my used oil analysis have shown it to be slightly above 11 cst.

 

[CATERHAM]

The KV100 spec' is not the bottom line in determining how thick or thin an oil is in an operating IC engine. It's the HTHS vis' that counts.
Both Mobil 1 5w30 and PU have the same HTHS vis of 3.1cP therefore they will have virtually the same operational viscosities.
A 3.1cP oil is not particularly heavy for a 30wt oil.

 

[tig1]

I ran Mobil 1 5w20 in 1978 in engines calling for 10-30 and 10-40. Back then the only negitive I had was oil consumption was a little higher.

 

[Scum_Frog]

Fear not the 5W-20.