I've been running Rotella 1540 diesel spec oil in my GTO's for the past 20 years without issues. Many, many miles. Run it in my '83 Toyota and my '61 Chevy too. My '65 GTO has a Sig Erson cam and my '67 GTO has a Melling cam. There is an interesting short video on Uncle Tony's Garage (youtube) that links up to another video about what's really going on with lifters these days, and it's scary stuff. No actual new flat tappet lifters being made, all are claimed to be reconditioned off shore, the bores are honed oversize to clean them up but the pistons are standard and bleed down, the foot of the lifters are ground flat and not convex and not hardened, and on and on. It took him something like 3 sets of 'new' HFT lifters from Jegs or Summit to make ONE set of decent ones that passed the bleed down and rocking tests. Sad.
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Jeff 
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