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First off, I have absolutley no experience with racing engines, but I recently had the 5 litre V8 in my Holden rebuilt. I'm a mechanic, but the actuall engineering work was done by a guy who really knows his stuff. I had a long chat to him about oils and he warned me against running synthetic oils in anything that has roller bearing surfaces, because basically it is too good, and the surfaces slip instead of roll, and this causes masive heat build up and burns the bearings. I can understand this, as we had similar experience with Moly Grease a few years ago. This stuff was the "ducks guts" in grease and we used it in everything. Then we started getting wheel bearing failures, and on investigation, they were burned from not rolling. Needless to say Moly grease is not seen anymore.
Hope this is some help.
Cheers.
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