Quote:
Originally Posted by Formulabruce
ZDDP = small bottle to oil change, NO Chemistry degree needed! Its under 4 ounces.
Funny the anti foaming stuff gets posted. This is why you don't need the oil over 212 degrees...
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My question would be: What is the ZDDP content of the oil you are starting with before adding your additional 4 ounce bottle of ZDDP?
Surely, there are many different oil brands out there. Each oil inherently has a different ZDDP content to begin with. Some oils could be so low in ZDDP that a 4 ounce bottle won't do enough good, while oils already high in ZDDP might not need a stitch of your 4 ounce bottle of ZDDP additive. In summary, different oils will end up with different ZDDP levels using your same 4 ounce bottle of additive.
That is the only reason I make my "chemist" comment. At the end of the day, can you be absolutely sure you are arriving at the correct balance of ZDDP?
This is why I would rather leave this job to professional oil blenders. I trust them to know what the correct level of ZDDP actually is, and I trust them to produce a consistent and repeatable product, bottle after bottle.