Originally Posted By: Ducked
I wonder if particulates do in fact significantly deplete the additive package. They are solids, so, although the surfaces will probably be acidic, it seems possible that most of the acid groups are on the inside.
I'd also wonder whether a filter can in fact be said to "remove" particles. Strictly speaking, they are still in contact with the oil which flows past them. As they start to form a "filter cake" then the effective surface area will be much reduced, but the filter is becoming clogged by that point.
"does not adversely affect" could be lawyer-speak for "has no effect". Same, but different.
We did discuss this during one of the previous microGreen threads. "Particulates" in this context would be soot or carbon black, and I think that explains why bypass filtration appears much more beneficial to diesel engines than gasoline (although that may change as the sulfur level in diesel fuel is lowered). When carbon black is formed from the combustion of a hydrocarbon it contains active sulfur complexes adsorbed onto the surfaces of the aggregates. The amount of these complexes is related to the amount of sulfur in the hydrocarbon. In the presence of water and heat these complexes will form acids. So by sequestering the complexes and perhaps sequestering some of the water a filtration system could in fact protect the TBN of the oil.
As for your other point I would further guess that the limited filtration ability of the Teflon disk is what promotes the filter change while allowing an extended OCI. You also get an amount of makeup oil with each filter change which also helps TBN retention.
I wonder if particulates do in fact significantly deplete the additive package. They are solids, so, although the surfaces will probably be acidic, it seems possible that most of the acid groups are on the inside.
I'd also wonder whether a filter can in fact be said to "remove" particles. Strictly speaking, they are still in contact with the oil which flows past them. As they start to form a "filter cake" then the effective surface area will be much reduced, but the filter is becoming clogged by that point.
"does not adversely affect" could be lawyer-speak for "has no effect". Same, but different.
We did discuss this during one of the previous microGreen threads. "Particulates" in this context would be soot or carbon black, and I think that explains why bypass filtration appears much more beneficial to diesel engines than gasoline (although that may change as the sulfur level in diesel fuel is lowered). When carbon black is formed from the combustion of a hydrocarbon it contains active sulfur complexes adsorbed onto the surfaces of the aggregates. The amount of these complexes is related to the amount of sulfur in the hydrocarbon. In the presence of water and heat these complexes will form acids. So by sequestering the complexes and perhaps sequestering some of the water a filtration system could in fact protect the TBN of the oil.
As for your other point I would further guess that the limited filtration ability of the Teflon disk is what promotes the filter change while allowing an extended OCI. You also get an amount of makeup oil with each filter change which also helps TBN retention.
