Since the problem of fuel dilution, if it occurring at all, will cause a problem down the road - not immediately - isn't the prudent approach to just test periodically for fuel in the crankcase. ![]() I've been reading here and elsewhere, and I would summarize my conclusions as follows: 1) the new TDIs will run on bio, but it might not be a good idea 2) VW's position is the up to B5 is fine, but they are taking a conservative approach that anything more could be a problem with the warranty if the "unapproved" fuel causes a problem 3) the primary problem has to do with potential of fuel getting mixed with engine oil, altering the lubricating properties - over time, this could lead to excessive engine wear and engine problems 4) no one seems to be sure if this is actually happening, especially at relatively low bio levels (B10, B20, for example). ![]() I'm in the process of purchasing a 2014 VW TDI, and I'm very curious about the feasibility of running bio.
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