Newsa, soot has been happening from the first time Dr Diesel got one of these running. diesel engines have soot in them.. the oil turns black.. change the oil and the filters and move on.
Newsa,I will. But I am one of those compulsive oil changes that changes oil and oil filters every 4-5 months even though I only drive 9k - 15k per year. I'm convinced city driving causes a bit of fuel dilution of crankcase oil as I see the dipstick level rise.
So you are realllllllllllllllllllllllllllllllly doing a partial oil change!!!!!!As mentioned above the Fumoto leaves more oil on the pan. I always add 11 5/8 quarts even with draining overnight.
Newsa,
As a chemistry teacher, perhaps you could devise a way to measure quantitatively how much of the old oil remains after draining the engine. Is there something you could to the oil add that could easily be measured? It would have to be something that can be detected by some means other than visual since the oil will be completely opaque, maybe an alpha emitter or something. Put it in the engine a few miles before you change the oil to mix it in well; sample the oil as you drain it, add a measured amount of new oil, drive around for a few miles to mix everything together, take a sample of the new oil and compare the ratios of whatever you added in the old and new oils. I think a lot of people would be interested in your results, and it might even convince someone that the tiny amount blocked by the Fumoto valve won't matter. Real numbers are better than speculation any day.
Newsa,
As a chemistry teacher, perhaps you could devise a way to measure quantitatively how much of the old oil remains after draining the engine. Is there something you could to the oil add that could easily be measured? It would have to be something that can be detected by some means other than visual since the oil will be completely opaque, maybe an alpha emitter or something. Put it in the engine a few miles before you change the oil to mix it in well; sample the oil as you drain it, add a measured amount of new oil, drive around for a few miles to mix everything together, take a sample of the new oil and compare the ratios of whatever you added in the old and new oils. I think a lot of people would be interested in your results, and it might even convince someone that the tiny amount blocked by the Fumoto valve won't matter. Real numbers are better than speculation any day.
My experience with valves is that they can get clogged with soot.
Is it me or is this whole oil change issue over-analyzed? You will NEVER get all of the oil out of any engine during a "normal" oil change. With or without a drain valve what could be left in the pan? A cup or two? We're putting in 11-12 qts of fresh oil and a clean filter. Nothing will get hurt by this.
Does anyone think a dealer oil change gets out close to what the DIY-ers here do?
While I understand everyone's concern over making these engines last forever, at the end of the day a little dirty oil left behind ain't gonna matter at all.
then your concern about leaving anything behind is a moot point .. not that it will hurt anything because most oil changes are not all day affairs.I only let my oil drain 20 mins or so. And I don't always do it with a hot engine.
then your concern about leaving anything behind is a moot point .. not that it will hurt anything because most oil changes are not all day affairs.