10w40 recommendation

[FCD]

Originally Posted By: dlundblad
Originally Posted By: 4WD
It was one of the early multi vis blends as mentioned in this picture:




What vehicle in the 70's would have had 5w20 as an allowable viscosity?

I would think 10w30 would be the thinnest.

I think my car ( 1975 ) allows 5W-20 but only in extremely cold temperatures ( below -35c or so ).

 

[kschachn]

As has been pointed out here multiple times, the original Mobil 1 5W-20 was not the same HTHS as today's 5W-20. No manufacturer specified such a grade when it was introduced but Mobil marketed the oil as a replacement for the (then) typical 10W-40.

 

[SwampSurvivor]

So how does 20w-20 work and how would it be different than, say, SAE20