Oil Question about ZDDP or lack there-of

[waybomb]

It is fairly well known that lubricating oil manufacturers have been forced to reduce ZDDP from their gasoline engine-oil formulations because ZDDP is linked to CatCon failures.

I didn't know this until I wiped out all three solid lifter cams and many lifters in my boat during last year's boating season and then went researching the causes of those failures.

The question is - how is this affecting older Benz engines, such as in my 16v, 420SEL and 300SL?

Should I be switching to off-road only racing oil or Rotella-T as has been suggested by cam manufacturers for the solid lifter big blocks? Or should I be adding GM's break-in additive as has also been suggested by auto pros? Does MB have anything to say about the reduced ZDDP and the effects on their valve trains?