So you all run fully synthetic oils?..The old 1970's recommendation was a 10W-40, but of course 10W-30 is thinner and will allow freeer spinning and get to the bearing parts easier, etc. I want an oil with higher ZDDP levels and I see Penrite states "FULL ZINC", but when you look at spec sheet it only contains 0.10%, whereas I'm looking for more like 1%+. I'm afraid mainstream oil manufacturers need to eliminate higher Zinc levels because they need to conform to the modern EPA standards so Penrite is out for me. I hope I'm not getting too pedantic here, but I do hammer my engines and race them regularly so I need the best protection I can get for the older style engine.
Dat2Kman - Where do you get your oil from?