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I have had results with M1 cleaning. This is verifiable via tear-down.
Do you mean that you tore down a dirty engine, left it dirty, reassembled it - dirty - then switched to M1 and tore it down again ..and found it spotless? If so, that's got some merit to it.
Otherwise you saw great deposit control.
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I would NOT expect carbon deposits showing up in the oil filter from switching between any of the well-known synthetic oils.
You may not. Take a long time on a PAO and switch to a group III or reverse it ..and you may.
Of course, (big smile, pal - Really
) I went from no consumption to freaked out consumption (none over 10.5k and 12.5k to one quart in 3k :shocked ..and eventually back to ZERO) all because of phase changes in the moon. Never could happen
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The bulk dino that was in the truck when I bought it was put in there by the dealer. It surely was different to what was run in the Expedition for the duration of its life. Yet there were no deposits left in the filter.
So? Suppose the engine ran on conventional Group II all of your pre-ownership life and was still running on Group II when you got it? Suppose it ran on anything other than a Group IV or V oil? Just "changing brands" doesn't come close to being the same thing as changing fundamental chemistry.
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I have not had any consumption with TDT/D1. I ONLY had it with the 5w20. BOTH oils provided junk in the oil filter. The TDT/D1 did it with no consumption. I am not one to correlate consumption with cleaning.......
..and you ran 0w-20 for how many OCI's? The vast difference in viscosity could have trumped the consumption in transition.
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My conclusions (about cleaning) were and are based on what I've observed with my own eyes. NOT UOA's.
The conclusion I was arguing against was based on UOA's, and NOT visual inspect.
Two completely different animals.
did you do a UOA on the sump where the junk was found in the filter? Back to back UOA with the same oil? Nope. A switch hitter. Even at that, where would the most likely collection point be ..on an otherwise SPOTLESS engine, for carbonaceous formations? The top of the head? The pan? The oil passages?
..the rings, maybe??
See what I mean? Apply the same inverted standard to your on opinion based conclusions ..even if they're based on direct observations.
I'm not hammering you. You're just punching holes in some things ..while leaving a few of your own uncovered.