Originally posted by Gary - KJ6Q
"Bottom line is this,you use whatever brand oil you want and accept the concenquences of your action as you do with your B. O. M. B. s. "
Exactly the point that has been made - use non-certified, non-DC approved stuff at YOUR OWN RISK!
Perhaps other year service manuals differ from my '98 SM, which states on page 9-3, "In gasoline engines, use an engine oil that is API Service Grade Certified. ... In diesel engines, use an engine oil that conforms to API Service Grade CF4 or CG-4/SH. " Thus, for my '98 12V, Dodge do not require that I use an API Service Grade
Certified oil in my Cummins engine. In fact, there is *no* "API Certified" oil available anywhere for diesel engines.
Perhaps if I keep posting this information, wording it differently each time, the meaning will get through a *few* heavy-duty crania.
There is a
big difference between
API Service Grade Certified and
conforms to API Service Grade.
API Service Grade Certifiied means that the American Petroleum Institute have certified that the oil in question does, in fact, meet the specifications for that grade of oil.
Conforms to API Service Grade means that the oil in question meets the published specifications for that service grade.
Thus, when D-C say to use a "Grade Certified" oil, they mean that the oil container must bear the API Certified seal.
But, when D-C say to use an oil that "conforms" to a specification, they do
not mean that the container must bear the "API Certified" seal. They would have so stated if that was what they meant. Instead, D-C said to use an oil that "conforms" to the service grade (at least in the case of my '98 12V).
And, to belabor the point a little,
#ad
shows that the API
certification mark is applied to gasoline engine oils
only, whereas the API
service symbol
#ad
applies to both gasoline and diesel engine oils. There is
no certification process in existence for diesel engine oils ("C" series classifications).
My apologies for the sheer size of the first image. I didn't expect it to be quite so *large*! But perhaps it's for the best, for it does help to make my point as graphically as possible.
If moderators know of a way to scale an image, please feel free to modify this post accordingly!
Fest3er