Here's the base HPL PCMO 5/30 VOA:
I'm not sure. Maybe one of the forum gurus will chime in to educate the rest of us7864ppm Sulfur. What is that? It says additive. Maybe associated with the molybdenum.
The TBN of 17.94 explains why a certain Member here was able to go 30,000 miles on this Oil.
The sulfur and crazy high tbn got my attention too. I know it’s a great oil, just wondering…I do understand that many elements which show up have multiple forms ("zinc" for example has many forms such as ZDDP, etc)
But I do have to wonder why so much sulfur??? Generally that is corrosive when it is combined with moisture (sulfuric acid), and also VERY detrimental to catalytic converters. (Hence ultra low sulfur fuels ...)
So is that sulfur in some form that otherwise does little harm because it's some variant of "normal" sulphur?
And is that why the TBN is so incredibly high; to offset the anticipated sulfuric acid from extended OCI?
The magnesium is 2000+ ppm that very high.Insanely high base number and this is their entry level motor oil.
Thanks for sampling.
Wasn't the Royal Purple Synerlec additive a heavy sulphur-based additive? People used to speak pretty highly of it.I do understand that many elements which show up have multiple forms ("zinc" for example has many forms such as ZDDP, etc)
But I do have to wonder why so much sulfur??? Generally that is corrosive when it is combined with moisture (sulfuric acid), and also VERY detrimental to catalytic converters. (Hence ultra low sulfur fuels ...)
So is that sulfur in some form that otherwise does little harm because it's some variant of "normal" sulphur?
And is that why the TBN is so incredibly high; to offset the anticipated sulfuric acid from extended OCI?
Sulfur containing compounds in lubricant Additives:7864ppm Sulfur. What is that? It says additive. Maybe associated with the molybdenum.
Was curious about the oxidation value as well.Added to the VOA Database. I'm disappointed that Wearcheck does not test for starting Oxidation on virgin oil. I saw your Used Analysis of this oil and they list Oxidation there. Why not on virgin oil?
I also noticed they use D2896 TBN for both new and used samples. This method is only supposed to be used on virgin oil, never on used oil.
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Email inquiry sent to Wear Check.Added to the VOA Database. I'm disappointed that Wearcheck does not test for starting Oxidation on virgin oil. I saw your Used Analysis of this oil and they list Oxidation there. Why not on virgin oil?
I also noticed they use D2896 TBN for both new and used samples. This method is only supposed to be used on virgin oil, never on used oil.
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So for us less “chemistry-educated”, is the amount of sulphur in the samples considered excessive, or is this something that is average in pretty much most motor oils? All I see is visions of sulfuric acid eating away at my seals!Sulfur containing compounds in lubricant Additives:
ZDDP (an ester of Zn[(S2P(OR)2]2); Zinc, Sulfur, and phosphorus.
Spikes, H. "The History and Mechanisms of ZDDP". Tribology Letters. 17 (3): 469–489, (2004-10-01).
Calcium and Magnesium Sulfonates
Molybdenum Dithiocarbamate or MoDTC (recall that a MoDTC compound formula is C4H8MoN4S8), or 4 carbon atoms, 8 hydrogen atoms, one or more moly atoms, 4 nitrogen atoms, and 8 sulfur atoms.
So any DTC compound is on the order of C4H8XxN4S8, where Xx is the metallic element containing one or more of the metallic atoms to create this organo-metallic compound.