Compcams oil additive - what if you used it in....

[Francis]

Compcams oil additive - what if you used it in a late model engine with a synthetic oil?

I know you are all going to jump and say NOOO it's got to much Phos and that will reck your cat's.

BUT: Firstly I wanted to know what actually does happen when people say that, is it just that the cat's become less effective or do they get blocked up and limit flow? Whats the truth here?

Secondly, lets say you add a half or quarter bottle with the next oil change, what's really going to happen? And if you did not care about the EPA would this be to much benefit to your engine?

Let's say it's on a Ford or Chevy late model V8 engine.

 

[Francis]

NO one really knows what happens to your Cat when you use high Zinc oils?

 

[SubLGT]

Title: Low Volatility ZDDP Technology: Part 2 - Exhaust Catalysts Performance in Field Applications
Document Number: 2007-01-4107

Author(s):
Ewa Bardasz - Lubrizol Corp.
Elizabeth A. Schiferl - Lubrizol Corp.
William M. Nahumck - Lubrizol Corp.
Jack C. Kelley - Lubrizol Corp.
Lewis A. Williams - Lubrizol Corp.
Carolyn P. Hubbard - Ford Motor Co.
Eva Thanasiu - Ford Motor Co.
Mark Jagner - Ford Motor Co.
Ann E. O'Neill - Ford Motor Co.
Dairene Uy - Ford Motor Co.

Abstract:
Phosphorus is known to reduce effectiveness of the three-way catalysts (TWC) commonly used by automotive OEMs. This phenomenon is referred to as catalyst deactivation. The process occurs as zinc dialkyldithiophosphate (ZDDP) decomposes in an engine creating many phosphorus species, which eventually interact with the active sites of exhaust catalysts. This phosphorous comes from both oil consumption and volatilization. Novel low-volatility ZDDP is designed in such a way that the amounts of volatile phosphorus species are significantly reduced while their antiwear and antioxidant performances are maintained.

A recent field trial conducted in New York City taxi cabs provided two sets of "aged" catalysts that had been exposed to GF-4-type formulations. The trial compared fluids formulated with conventional and low-volatility ZDDPs. Results of field test examination were reported in an earlier paper. As a part of our current examinations, Federal Test Procedure (FTP-75) emissions tests were conducted. Emissions data collected showed a statistically significant difference in 50% hydrocarbon (HC) efficiency light-off time, on low-impact ZDDP as compared to conventional ZDDP, and an even greater effect on nitrogen oxides (NOx) and carbon monoxide (CO) emissions due to a reduction in the phosphorus-derived catalyst deactivation.

 

[nascarnation]

What late model engines are failing due to a lack of these additives?

 

[boxcartommie22]

i read and not sure where or even if iam totally correct, one would have to use an extremely high amt of zinc and phos to hurt the cats...>5000ppm...i use this stuff i just add 1 oz in each qt of oil thats it..this stuff is loaded with tons of moly, zinc and phos.

 

[Francis]

Ithought they did not have moly in them, only Zinc.

OUt of interest how much PPM of Zinc does a bottle of the Compcams stuff have?

Can there be any other issue's using this stuff in a late model EFI engine?

 

[boxcartommie22]

tech support told me but did not tell me the amts.he just said loads of moly,zinc,and phos. so far.we need to do a voa on this additive

 

[Francis]

any other issue's using this stuff in a late model EFI engine?

 

[bdcardinal]

what if it was a late model engine with no cats? like if it was being used in a race application? it might help, although with the motor that i would use (ford 4.6) there might not be an advantage.

 

[Steelhead]

which oil manufacturers are using novel low-volatility ZDDP?

 

[Francis]

Seems that there is not alot understood about this stuff just yet.

 

[Francis]

Anyone used the Crane one?