A person I know well, used aviation kero (fuel drains) for over 400,000kms , at 100% , had an IP fail due (maybe) to water in the kero, still not a bad mileage for free. The IP might have gone out for other reasons.

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'72 240D
'76 300D
'88 300sel
'40 Chev pickup , the shop hack.
'73 Monte Carlo Landau, for "Super Chevy Sunday"