Join Date: Dec 2008
Location: Tyler, TX
Thanked 407 Times in 347 Posts
Bad wiring to or from the IPR valve can cause this, the incorrect oil type will cause this, as will extended oil drain intervals with even the right oil type.
'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).
Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote - Benjamin Franklin
I vote for LIBERTY!