GTI-R US
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Posts : 8349
Join date : 2012-03-04
Age : 108
Location : DONT KNOW ANY CLUES???
Yeah 4 is a bit high at hot idle especially rising to 8 on the move
You may have a faulty oil pressure sensor so could be worth trying another to see if it reads the same or drops
If still high I would say your oil pressure relief valve in the pump may be sticking and not releasing the pressure which could give you major probs with pressure seals in the tubby.
Could also be a kinked or blocked return over pressurising turbo or as said above if you have a cracked ring land you'll end up with excess crankcase pressure which also won't help your cause.
Or could just be the replacement turbo you fitted was on its last legs
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