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Pitts s2a lycoming io-360-a1a

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hnivers

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Hello, just startet flying for a new season after full conservation, i just notice that my oil pressure is a little low, at 70-73 steady it used to be 85. Have used aeroshell oil w80+ ,now it is only w80. Difference is anti corrosive in the pluss type...
Well, what could it be? Temp is steady at 180 f, normal spring temp at 10 deg celcius.. I hope it is not any internal problems... But could it be the gauge rhat is quite old now?
 

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