[Mgs] ZDDP

[PaulHunt73]

They certainly do not.  Opinion, for what that's worth, reckons 1200-1300ppm 
is what is needed as a minimum.  Formulations for modern engines contain 
significantly less phosphorus and zinc as they reduce the life of the 
exhaust catalyst and are perceived to be harmful to the environment. 
Generally speaking the later the API spec the lower the phosphorus and zinc. 
It also varies with manufacturer, product and market.  The claims from some 
manufacturers are also very suspect, one claiming that theirs meets the 
latest API spec i.e. SM but has higher levels of zinc.  50s oils like 
Castrol XL API SE also aren't as good for our engines as later 70s API SJ 
formulations.  There is a huge amount of information and misinformation out 
there.  API SJ for Diesel engine is probably one of the best as it contains 
more of the required additives to protect the little ends in those engines. 
For a specific in the UK Comma Sonic contains about 2000ppm.

OTOH, as stated a good quality oil of a suitable formulation and viscosity 
isn't going to do much harm.

PaulH.

----- Original Message ----- 
> Just buy a good quality oil and forget about the ZDDP. Current oils have
> levels about the same as late 50s, early 60s oils.