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Tapping the oil pan follows a similar procedure. The best spot to tap is right below the knock sensor on the passenger-side of the block, roughly 1/2-inch below the oil pan rail. Zimmerman first drills a 1/8-inch guide hole, enlarges it, and then cuts some threads with a 3/8-inch tap. A 3/8-to-10AN adapter fitting is then screwed in before hooking up the oil drain line. Just in case some metal shavings slip into the pan, Zimmerman recommends draining the existing oil, then running another seven quarts through the pan before filling it back up. Due to the heat generated by the turbo, Fastlane suggests running 20W-50 weight oil. View Related Article
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