its running 10/40 grade oil atm, castrol gtx, not the magnatec variety tho as iv heard it can block oil ways, altho im guessin they r blocked anyways frm wot u r saying!!! lol

so is this more than likely going to b a head of check up and clean up job to remedy?

could it b a dodgy oil pump as a possibility?

i do not kno the history of the engine as it is a conversion, i kno the head was new, but the bottom end was just a 2nd hand unit, no mileage confirmation