Bill ,thank for your answer I think was for me, now it's more clear.
Yes we changed oil several time, cleened the tanks and the fuel circuit in all planes. Let me tell en other thing we learned at that time : We have a Tecnam P92 rotax 912 S2 equipped, certified plane, high wing . It was brand new, just arrived from factory when the the story of cotamination did begin. After a month in the contaminated fuel( 13% diesel) the carburators floats needles were not closing anymore. the result was: leaking intake filters and fuel into the intake manifold in the pistons trough the rings and into the oil eventually. Yes we had en increse of oil level overnight, no engine running if fuel valve was left open ( high wing few feet of pressure)
the rubber part og the Needles were partailly melt. Same things happened to other planes refuelling alwais at the same fuel station. So if you suspect diesel contamination for a period relativelly long ceck the carburators needles. Take a look to the pictures : it sais: "Needles after 130 days immersion in fuel contaminated with 13%diesel" ;but they start to leak after a month
ciao Diego
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