Quote:
Originally Posted by KULTULZ
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Ok, still trying to figure it out, just for the sake of continued discussion & possible clarity.
They do briefly mention older flat tappet engines and are of course representing their own product.
I read both of these pages of theirs...
https://tech.drivenracingoil.com/zinc-in-motor-oil/
"Having the right balance of additives is the key to application-specific protection and performance."
https://tech.drivenracingoil.com/buy...l-oil-changed/
Apologies for the length of this quote from this link.
(emphasis added)
"
Certified Lubrication Specialist Lake Speed Jr. explains ZDDP creates a sacrificial film on contact points that acts as a wear surface in place of the metal. As ZDDP is reduced or more detergent is added, that film can decrease and component wear increase. Substantial chemistry changes in the new diesel engine oil categories mean the widely accepted use of diesel engine oil plus ZDDP additive during the break-in process is now a riskier proposition than it was a few years ago.
“Diesel oils are becoming more specific to applications, and people using them off-label need to be aware,” says Certified Lubrication Specialist Lake Speed Jr.
The American Petroleum Institute’s new heavy-duty engine oil categories effectively eliminate backwards compatibility in the industry. CK-4 is the replacement for current diesel engine oil categories, while FA-4 is a new category altogether, created in response to updated greenhouse gas (GHG) emission standards affecting engines to be manufactured in 2017 and after.
Speed says owners should just steer clear of diesel engine oil in their gasoline engines and pay close attention to new labeling if using diesel engine oils in their towing vehicles.
“This really is risk management,” says Speed about the importance of protecting engines with the right oil, from the start. “Curveballs are being thrown here. So, buyer beware.”
He recommends during the break-in process owners turn to a ZDDP-enhanced oil rather than the new diesel engine oil options to improve surface mating and extend the durability of internal engine components in their new or rebuilt engine."
What I'm getting from these pages is that ZDDP is still a useful/needed ingredient in motor oils for older gasoline powered vehicles built before emission equipment was required.
BUT just because you buy an oil (in this case a generic 'diesel engine' oil) that you thought had enough ZDDP in it,
Do not assume it does without checking the label / ingredients, if it's listed.
An engine oil marketed specifically for 'Classic' or 'Older' vehicles, or one that points out its higher formulated ZDDP content will likely be a better bet to use.
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