You know, your turbo can’t be seeping oil in your exhaust if you don’t feed it. For M10 the oil pressure switch bore is located next to the spark distributor in the rear of the cylinder head. For M20 the oil pressure switch bore is located under the exhaust manifold. For early M30’s the oil pressure switch bore is located on the rear intake side of the cylinder head. Early M30’s have a plugged outlet on the oil filter body too. For late M30’s the oil pressure switch bore is located in the base of the oil filter housing. With it you can use 12mm banjos and preferably high temperature capable braided hoses to plumb it to your turbo. Sensor and banjo not included!
