Just a cautionary note- Just pulled the motor apart on my 1969TR6. Now what does this have to do with BMW's??? Well there are similarities with the BMW and triumph in the lifters and cam. Both have the same lifter and cam design. I've always run Castrol 20w50 not motorcycle specific though. Long story short, after 7,000 miles, my new cam and resurfaced and hardness checked lifters are shot. Wow that didn't take long. One cam lobe is gone, 10 out of 12 lifters pitted, all cam lobes show pitting. This has me very concerned about ZZDP content even in in the motorcycle Castrol 20w50. The motorcycle specific should have more, but I may still start adding ZZDP to the BMW oils also. lobes pointed to should be the same height.