71 198 slant six oil

I have several slant six engines, from stock to turbo, to nitrous. The only oil I use is "house brand" 10w-30. The only time I use an additive, is when I assemble the engine. The only time I have had a oil related failure, was in 1977, I had a #5 rod bearing go bad in a race motor. And lost a cam lobe on a Mopar Performance .528 lift cam, about 5 years ago. I don't think that was caused by the oil. as there were "pattern" failures on these cams.