Oil pressure and flow, feed line can be ok but if restricted at the drain there is no flow.
Oil analysis for contamination, less than £50. Fuel dilution being a possible factor, 4% is the critical limit.
T6.1 had a selection of three different 150 engines. Would be helpful to know exactly which one you've got.
As above - not all T6.1 150 engines have the N75.
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