Club Cobra - Looking for Oil recommendations...

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I'm on a very steep learning curve here.Thanks to all you knowledgable gentlemen. Would the oil filter have to be changed for different oils ?
Cheers Jeff

The oil filter gets changed whenever you change the oil.

4qts of clean oil + 1qt of dirty oil = 5qts of dirty oil.

Thanks Bob
I should have said differenf Viscosity oils
Jeff

You should still change the filter, even if you're draining "clean" oil just for a viscosity change. The filter contains 1/2- 1 qt of oil, and you don't want to mix any more of the old oil than you have to.

As for the filter type, use the best one you can find, always. But you don't need a different type or brand of filter for different viscosities. I prefer a Purolater Pure-1 or Motorcraft.

Oil Recommendations

Quote:

Originally Posted by Morris (Post 1277682)

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....

Quote:

Originally Posted by Ant (Post 1278218)

Correct.......

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

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

My oil pressure is at 75 psi when cold. That seems to be too much. I ran joe Gibbs HR 20-50. I just bought HR 15-50 and will see if that number comes down some. Im at around 30 psi when hot.

IMO , 75 psi cold isn`t too high . Mine runs 80 to 85psi cold , 57to 60 psi at 200 degrees oil temp and 35 to 40 at idle , hot . I run 15W - 40 Brad Penn street and track . Is that 30 psi at idle or another rpm ?
Since you`re up North where it gets a little colder than here ( SC ) , you may want to go with a 10W - 40 for Fall and possibly 10W - 30 for Winter .
Just a thought .

Theres not much difference between 20-50 and 15-50 when HOT, they both behave the same.
I found about a 5 lb. difference in oil pressure between 15-50 and 10-30 Gibbs Hot Rod oil HOT. I also noticed a difference in temperature between the two. In my SBF the 30W ran 5 degrees cooler than the 50W. I'm staying with the 10-30.