Looking for Oil recommendations...

[Ant]

Originally Posted by Morris

Bob

You only quoted a small portion of what I was talking about.....

"Molecule . a quantity of a substance, the weight of which, measured in any chosen unit, is numerically equal to the molecular weight; gram molecule.
any very small particle."

The size of the molecule will determine the viscosity.....

And like I said...5W30 stands for 5 weight winter oil at 32*degrees and 30 weight molecule at 212*degrees .....

So in the racing world....when Mobil came out with their 0W50 racing oil with 1800 ppm of ZDDP......many of us changed over to it from SCCA, NASCAR, to INDY Car, because it flowed on initial start up and the 50 weight molecule worked great at the high temperatures....on our cams and crankshaft.

BTW....if you have ever seen 50 weight oil at temperature flowing......it looks like Black Water......

I see Mobil don't recommend this oil for the street, I assume this is due to the higher anti wear properties like Zinc etc which affect catalytic converters. I am interested in this oil for racing and a bit of street use. I wonder if you would use the OW30 in the colder months....

[Morris]

Originally Posted by Ant

I see Mobil don't recommend this oil for the street, I assume this is due to the higher anti wear properties like Zinc etc which affect catalytic converters. I am interested in this oil for racing and a bit of street use. I wonder if you would use the OW30 in the colder months....

Correct.......

Porsche uses 0W40 and it seems to be a good compromise.....

We ran 0W50 in our Dry Sump system and it worked fine...