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Originally Posted by jbach36
The company said it's the highest number, by far, for TB, whatever that stands for, which is why it can go for so long. Their brochure says it's for diesels as well as gas. "Guarantees a cool, quiet performance with extended drain intervals, longer engine life, and no dry starts". I think I'll call them tomorrow, talk to someone higher up on the totem pole. But even with their little plastic turn wheel, you can see how the oil sticks to the gears much better than regular oil. ... I just wonder how good their guarantee is.
Even if I went longer on the oil changes, that brings me to the next question, how long can an oil filter go before needing changed?
1991 300d, 90k
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TB = thermal breakdown. Not something one worries about unless you are racing or have a turbo (gassers run hotter). I use regular Rotella diesel oil, it analyzes well for soot and viscosity at 4000 miles, so that's what I use.