An old engineer friend of mine used to recommend sticking a bit of diesel oil in my old Land Rover as it had more detergent properties than petrol oil. Didn't seem to do any harm but it was in an old 2.25 petrol....
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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