Oil Drain Requirements

A gravity pitch from the turbo to the oil pan with as little restriction as possible is essential for reliable oil drainage. If gravity drainage is not possible for your application, a scavenge pump may be used to return oil.

• Avoid using 90° and 45° fittings, as these can restrict return flow and reduce system reliability.

• The oil return line should enter the pan above the oil level and as far from crankshaft windage as possible—ideally in front of a main web. If that location is not feasible, position the return high and forward of the oil sump. (Application details may vary; it is each installer’s responsibility to ensure proper, correct installation for optimal performance.)

• The oil return line should be as large as possible:

  • For small and mid-frame turbochargers, a minimum of -10 AN line is recommended.

  • For large-frame turbochargers, use at least a -12 AN line.