if the guy lets you, take the intake piping off the turbos to check for shaft play and to check if theres oil in the intake, check if the gears grind and listen when not pressing the clutch and see if theres a winding noise that stops when you do press the clutch (transmission bearings) cuz w58 transmissions seem to be prone to leaking. Those are pretty much the things that are specific to his setup that your gunna need to check, the rest would be pretty much regular inspection stuff like on any other car.
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