Pep Boys

Manny, Mo & Jack have a 35% off coupon plus free shipping; its good through the end of the day. They have Mobil 1 vtwin 20-50 which is a high zinc oil. Walmart is still the best source for 5qt ($26) jugs of M1 15-50.
Use the coupon code PEPTHANKS

 

I'm not using M1 vtwin in this car, yet, although I do use it in another old car that I have. The zinc levels are a really high 1750ppm. I'd love to hear from some of the more experienced guys on this board who have rebuilt v12's or at least looked at the cams to hear what they think of zddp levels in oil. I have a 911 and the air-cooled porsche guys obsess over zddp.
The M1 15-50 has a decent and hopefully ok for our engines level of 1300ppm.
Currently I'm using rotella T6 5-40 because its pretty cheap, durable, and I've been doing a lot of short drives the past few months trying to sort out some issues.