what oil are you guys running??

2:soapbox: cents worth

I run Rotella T 15W40 - most Zinc oil out there at just about 1300parts per million.
No need to run a Zinc additive as conventional oils back in the 60,70,80's were around 1000ppm of zinc. Additive is just an over kill if your oil is the correct grade fro your application with enough Zinc. Plus the engine starts with better and quicker oil pressure on first fire and maintains a stronger pressure while in use.
Joe Gibbs break in lube to start the new engine for 20 minutes of break in then filter and oil change to Rotella for 100 miles of long easy driving. Then change again.
OKay - off the soap box now.