The bearing is not the problem; it's the lack of proper lubrication & cooling.

D.O.F. ® Fitment Guide

  • Porsche Boxster 986 MY 1997 - 2004
  • Porsche Boxster 987 MY 2005 - 2008
  • Porsche Cayman 987 MY 2006 - 2008
  • Porsche 911 Carrera 996 MY 1998 - 2004
  • Porsche 911 Carrera 997 MY 2005 - 2008
  • Excludes Turbo, GT2, GT3 and DFI models

Oil feed systems to ball bearings found on rotating assemblies, machinery equipment, turbo chargers and turbine engines have been in use for years even before Porsche's M96 / M97 engine platform. It is not a new concept to provide proper lubrication, cooling and particle contamination removal to a ball bearing that requires it, so the same concept has been applied to the IMS bearing found on the M96 & M97 engines. Ball bearings have been and are still in use in Motorsports and racing engines to this day. 

Why Direct Oil Feed ® ?

The intermediate shaft bearing found on M96 and M97 Porsche engines require a constant flow of oil to provide the necessary lubrication and cooling the IMS bearing needs. Simply relying on “splash lubrication” or “mist lubrication” is not sufficient to drop operating temperature on the bearing and lubricate. The cooling benefit is a drop of 30 degrees F to the IMS with the addition of a DOF. 


In 2009 Miguel (Mike) Potolicchio of TuneRS came up with the initial concept and invested much of his time and energy into designing, testing and developing the Direct Oil Feed (DOF)® lubrication system. Several vehicles were picked during the development stages and prototypes were installed, carefully studied and documented. The first prototype was installed in early 2010 on a 1998 Porsche Boxster street driven & lightly tracked vehicle. The first finalized, non-prototype DOF® was presented in early February at the 2013 PCA 48 Hours at Sebring. We placed this first finalized DOF® on our #93 Spec Boxster (build #001) for the 48 hour Sebring PCA club race event and documented the results (specifically oil pressure drops and other parameters) afterwards. Our analyses also determined that the oil fed to the ball bearings had cooled the bearing temperatures on an average of 30+ degrees Farenheit. After the success and interest at Sebring we began to offer our Direct Oil Feed System (DOF)® lubrication kit as a solution for all MY97-08 M96 and M97 Porsche engines with IMS bearings. 

Direct Oil Feed Information Videos

Frequently Asked Questions