- Joined
- Apr 13, 2008
- Messages
- 1,045
- Reaction score
- 114
- Points
- 63
- Location
- Ft. Lauderdale, FL
- Vehicle Year
- 99
- Make / Model
- XL Spurt
- Engine Type
- 3.0 V6
- Engine Size
- 3.0 (Flex)
- Transmission
- Manual
- 2WD / 4WD
- 4WD
- My credo
- A properly suspensioned Ranger can be safely airborne for up to 4 seconds at a time! =:O
fixizin:
I work for the company that was once Pennzoil (new owners of the refineries now). The Pennzoil/QS company no longer exists, except in name only (Shell owns the name). Pennsylvania crude is about depleted and the sources come from all over the world.
Refining technology has changed tremendously and to meet the latest API specs. Wax is a constituent that occurs naturally in all crudes, but the vast majority is removed (and sold!) in a process called MEK Dewaxing. This is a solvent extraction process that also uses refrigeration to crystallize and remove the wax. Any traces of wax in the base stocks are further eliminated by processes such as Catalytic Dewaxing (CDW) or Iso Dewaxing (IDW).
Bottom line - do not fear sludge from wax in the motor oil anymore!
Good to know. This Porsche mechanic has been retired for almost 10 years, but when someone who has torn-down HUNDREDS of (mostly) air-cooled engines ('tween say, 1967-2000) says that the most HEAVILY SLUDGED engines were (almost) ALL running either QS or PZ, *and* that the Castrol and Valvoline users were MUCH cleaner, then something's GOTTA be "going on".