Giovanni- Thanks for the tip on the comp cams additive. Is the 1,000+ ppm the sweet spot we should be aiming for? I haven't found any specific info on that, but it looks like it might be the right concentration since the zddp added oils also seem to be around that number.
Found your thread about the larger oil filter (for diesel), very cool thanks, will look into that. Here it is in case anyone else is wondering http://www.mightyram50.net/vbulletin...zed-oil-filter

Pennyman- Thanks for the feedback, I checked out he oils you mentioned, and like the Valvoline VR1, they seem to be around 1,200-1,400 ppm, so I'm going to assume that this is the right concentration window.

Other than price (using an additive being cheaper than using a high zinc oil), are there any other advantages to go with an additive like comp cams, eastwood or STP, over the high zinc oil?