oil additives

i WOULD THINK ANY ADDITIVE ADDED TO THE PRESENT FACTORY OIL WOULD AT THE VERY LEAST CHANGE THE OIL.

I WORKED FOR A LARGE FLEET ONCE AND WE WERE HAVE TROUBLE WITH THE OIL SLUDGING UP ON A FLEET OF CARS. AFTER CHANGING OIL BRANDS A FEW TIMES WE DID SOME ANALYST ON THE OIL AND FOUND THE FUEL WE WERE USING HAD A ADDITIVE IN IT CAUSING THE PROBLEM. IN THIS CASE THE FUEL COMPANY CHANGED THEIR ADDITIVES FOR US AND WE WERE FINE AFTER THAT...
 
45 years ago, Ed Justice told me that STP was 135 wt. motor oil.
It was not fun working on an engine that had been run with STP.

Bruce

Works good
Lasts long time
 
The Federal Trade Commission determined long ago that STP Oil Treatment was not all it was cracked up to be. In 1976, STP faced a consumer protection order that required it to have scientific backing for certain statements and prohibited making false claims. In 1978, it paid a $500,000 civil penalty over claims. In 1995, it paid $888,000 to settle Federal Trade Commission charges of false advertising.
 
Modern engine oils already have such a complex bunch of additives already in them, especially mutiviscosity oils, that I wouldn't think adding any more would improve on them and more likely deteriorate them. That being said, I do add a little ZDDP to mine just in case the extra zinc helps prevent lifter and cam wear. I'm not saying it does - but just in case it does. All right - I have been known to add a little MMO one one occasion. Again, can't say it helped anything - but, just in case it might have.
 
Get good oil and forget the additives. Valvoline Cummins Purple has all the good additives in it. G.M.
 
G.M. said:
Get good oil and forget the additives. Valvoline Cummins Purple has all the good additives in it. G.M.
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I don't think you will find any oil called Valvoline Cummis Purple. The closest thing is Valvoline Premium Blue but it is formulated for compression ignition (Diesel) engines. Probably wouldn't hurt a gas engine but why use it when there are so many formulated specificlly for spark ignition (gasoline) engines? Gasoline and diesel oils have different additive packages because the contaminates in the crankcase are different. With a gasoline engine you get a lot of moisture and tar and with a diesel the oil becomes acidic and will collect more carbon.

Many oils will work well in either engine type but it's always best to use an oil specially formulated to the type of engine for optimal life.

You will see things like "API SG or CJ" on the oil container, that means:

API = American Petrolium Industry
SG = Spark ignition, grade "G"
CJ = Compression ignition, grade "J"

The second letter is the grade designator, in alphabetical order, and later = better.
 
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