Question about Moly & 2007 oils

[Stormbringer1992]

Hi All!

I see that "moly" is listed as an ingredient in most oils, and is talked about as a good anti wear compound..

Are molybdenum disulfide and molybdenum dithophosphate sources of sulfur and phosphorus emissions, and thus subject to the same scrutiny and reductions as ZDDP?

I haven't seen this question asked or answered anywhere yet..

 

[Blue99]

While your statement & the phosphorus & sulfur connection to moly D2sulfide & dithiophosphate are probably accurate, (I'm not a chemist!) the form of moly used for anti-wear & as an anti-oxidation agent in PCMO oils is molybdenum bicarbonate.

So the primary targets for suspected catalytic converter fouling have been addressed in the last 2 years, with sulfur levels being drastically reduced in gasoline and of course, the ZDDP/Phosphorus in motor oils.

 

[toocrazy2yoo]

Not moly, I believe it's indestructible. Film strength is somewhere in the 5-6-7 HUNDRED thousand pound range. You can't burn it. I cannot imagine moly is a source of catalytic converter contamination. Moly is in such abundance in many motor oils because of the need to replace zinc.

 

[Blue99]

I wrestled with the search function for a while & was able to find a couple of good threads from previous years:

Sulfur in Motor Oil Thread

Types of Moly Thread

Included is an explanation by Molakule, of the soluable form of moly, MoDTC or Molybdenum Dithiocarbamate and how the "thio" is indication of the presence of sulfur in the compound.

So, yes, sulfur is present in the MoDTC, but the real question is whether any volatility is connected with this additive that would put sulfur into the emmissions system components.

 

[Stormbringer1992]

Thanks for the responses, and especially the links Blue..excellent reading..

 

[427Z06]

Quote:

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So, yes, sulfur is present in the MoDTC, but the real question is whether any volatility is connected with this additive that would put sulfur into the emmissions system components.

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Same type of deal with ZDDP and phosphorus. Many wrongfully assume that high levels of ZDDP are only a problem with engines that consume oil.