Ian
Notorious member
Brad, some Comp Cams or Crane engine break-in oil additive is going to be your best bet for "STP" uses. Those oil additives are positively loaded with ZDDP. I'd go full synthetic on the other stuff, just pick a brand of syn ATF that's not too stinky and remember that the trend with ATF is to go lower and lower with the viscosity, so Dexron VI is about half as viscous as Dexron III was...at room temperature. I'd be tempted to grab a bottle of Royal Purple 5W-30 and a bottle of Comp Cams lube from an auto parts store http://www.autozone.com/miscellaneo...12-oz-bottle-engine-break-in-lube/892272_0_0/ and cut it with a dash of Dexron III if necessary. In fact, Monday I'll mix some up and give you a report. I'll also do a little sniff test of the synthetic ATFs that I have and see if I can make a better recommendation.