did you install a "aftermarket" oil restrictor/reducer on this turbo? no? then you already blown the inner oil seals of the turbo
the stock s15 silvia turbo has no oil restrictor/reducer on board, its in the oil feed line of an s15, so if you dont run the s15 oil feed line and no aftermarket reducer, your turbo was running way too much oil and oilpressure
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