Craig:

I am very interested in your opinion on the following:

Would it be correct to assume that based on your experience, you would choose a straight 50 weight over Phillips 20W50 for a big bore TCM engine run at above 85% power?

Walter


On Mar 29, 2005, at 8:19 PM, Craig Berland wrote:

"What is your understanding of the automotive experience with the
multi-viscosity oils ???  Regards,  George"
 
George, the multi-vis oils are/were a necessity for fuel economy ratings and cold starts (below 0 deg F).
They are not so good for WOT testing. All max load and valve train tests were run on straight 30w oil.  Oil consumption and engine durability all improve with straight weight oil. I might add I have not seen tests run with the new synthetics such as Mobile 1. With that said, I just put the new "Purple ??" synthetic oil in my new truck.  But my truck sees <10% power 90% of the time. In 1987 I left GM and started a company manufacturing aerospace parts. My wife calls it my momentary loss of sanity.  Oh, I do like the LS1 a lot...I just finished a customized '72 Chevy truck with the LS1 and 4L60E trans....very nice and very fast.  My youngest son's project with dad.
Craig Berland