alot of good choices for oil/additives. Brad Penn oil gets good reports & I think has enough zinc as is and there's hughes' moly breakin lube to pour into your choice of oil and several good combinations. Check the archives & see if any of the prior posts are there that have a ton of good info. Not sure on the weight. I gotta ask with changing the breakin oil being std procedure on a new rebuild breakin & him not doing that is what breakin procedure DID he use. Hopefully 2500 rpm for 20-30 minutes w inner springs removed & I'm a believer in goosing the throttle many times during that time.