<VV> Oil with ZDDP

[BobHelt at aol.com]

The following information is both correct and misleading. One needs to  
understand the underlying specs.....
Please see below.
Regards,
Bob Helt
 
 
 
In a message dated 3/17/2010 9:28:06 A.M. US Mountain Standard Time,  
hmlinc at sbcglobal.net writes:

>From the  Royal Purple web site...

PASTE:
Do your motor oils contain zinc and  phosphorous?

Yes. All Royal Purple engine oils contain the  zinc/phosphorous compound 
zinc 
dialkyl dithiophosphate (ZDDP) and are  suitable for both roller and flat 
tappet valve trains.
Well yes, all available modern oils contain zinc and  phosphorous. It is 
the AMOUNT of these additives that is important. And even  though the API 
tests "prove" that reduced amounts of these additives are  satisfactory for flat 
tappet engines, THAT is the bone of contention that  concerns us all....DO 
THEY???
 
 



Can your oil be used with flat tappet cams?

Yes. For  stock or mildly modified flat tappet valve trains (<.525” lift), 
we  
recommend our SAE 10W40, 15W40 or 20W50 engine oils.
 
Note that they are recommending oils that DO NOT HAVE TO MEET  THE REDUCED 
AMOUNTS of additives. So on one hand they say reduced amounts are  OK, but 
on the other hand they recommend oils with a higher amount of  additives.
 
Lots of double talk here IMO.
Regards,
Bob Helt