Posted by JMOR on October 01, 2023 at 12:51:12 from (76.187.196.138):
In Reply to: Shell Rotella? posted by Geo-TH,In on October 01, 2023 at 03:54:01:
Quote: CVPost-Geo-TH,In (quoted from post at 14:08:42 10/01/23) Richard,
Remember King Richard?
He drove the #43 STP race car.
Fact check; Is Zinc one of the active ingredients in STP? IF not what is the active ingredient?
If So, we call STP snake oil.
If Shell adds zinc to their oil, they can Call it Rotella.
Isn't chemistry neat?
A half lifetime ago when I overhauled engines, I would coat all parts with STP when I was assembling the engine. Never had an engine lock up.
DuckDuckGO the term ZDDP (zinc dialkyldithiophosphate) . It has been used in motor oils since ~1940's and GM once offered an additive package containing ZDDP. After cat converters, the levels were reduced, but still present, as far as I can tell, with more in diesel than oil for gas engines.
Sometime the limit of 800PPM was set (probably cat converter), but prior to that 1400PPM could be found in oil for diesel (CI) engines. I had a can of un-opened oil from the 1960's and a lab analysis showed only 517PPM. It has designation (now obsolete I think) of MM-MS-DG .
I can report it had MM-MS-DG stamped on the top of the can, which means, in the current API system it would have met SC standards of 1964 or their upgraded 1968 standards for SD (both called MS back then), and DG means a CA for diesel use. The use of the word "plus on the label might have signaled the higher level that became "SD".
This post was edited by JMOR on 10/01/2023 at 01:02 pm.
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