Pierre has an active imagination with apparently, a lack of any practical knowledge or experience to back up his comments:
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Originally Posted by Pierre Louis
One example: at the start of the talk, oil gets degraded by going down in viscosity. Later in the talk, soot makes it "thicker."
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Both statements are true, and happen independently of each other for different reasons in the same oil drain cycle. The factors affecting those reasons are variable.
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Originally Posted by Pierre Louis
Another: long drain intervals are bad if you have EGR putting "soot" into the oil through the combustion chamber. If EGR puts a lot more soot into the oil from the combustion chamber, think of all the soot combustion puts into the oil in the first place! Illogical!
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Perfectly logical, if you understand the soot migration process. A well-tuned, healthy engine is designed to generate or allow minimal soot past the rings via blowby, and what is gets handled by the oil. Soot coming back through the EGR is additional to what would otherwise normally be present, cooled and more susceptible to agglomeration.
Quote:
Originally Posted by Pierre Louis
Another was where he said that separate combustion process to clear the DPF with some designs causing oil contamination in the engine. This process is far away from the engine and has nothing to do with fuel contamination of the engine oil.
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In this care Pierre, you are the one who is absolutely wrong. The injection event(s) for regeneration certainly do generate more soot later in the combustion cycle, heat the DPF and BTW, increase whatever level is traveling through blowby into the oil, through richer mixture AND HIGHER soot volume during those cycles.
Au contraire Pierre, your imagination regarding diesel soot and certain regeneration events with what's happening upstream of the DPF is clearly misinformed by an active imagination.
