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I ran used VO in my '78 "old300D" for a spring and summer last year. It was tired and I didn't much care if it broke on me. I noticed it ran progressively worse on diesel fuel, a lot of knocking, and it never had any power anyway.
Anyway, the engine had a bit of blowby, and when I changed the oil it seemed different, a bit sticky. I figured I had unburned and partially burned VO getting into the crankcase.
I had fun, but I wanted a daily driver, so my 240D will never see any un-reacted VO again. It runs very well on diesel, and even better on B100. I expect it will stay that way too, as oil analysis is favorable.
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