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Oil restrictors are needed for journal bearing turbos when their experiencing too much oil pressure. The oil restrictor has a .060" hole, which reduces the amount of oil going into the turbo. We now carry oil restrictors for 1/8"npt and 1/4"npt oil inlet turbos. Please choose the proper size for your turbo application.
Garrett recommends using an oil restrictor in a journal bearing turbo if your are having oil leakage due to high oil pressure.