Could switching back and forth from conventional & syn .oil be BAD????

Messages
265
Location
NY
I'm only asking as I heard from a few friends that "once you go Full Syn. oil you cann't go back to conventional oil due to causing spun bearings, along with other problems!!!". Now I really do not believe this but I know some on the board do switch ALOT and has anyone have/had any problems? I'm thinking of switching from M1 to Pennz or Chevron conventionals to see how my car likes them but I do not want to cause a problem. BTW my car is a 99 GTP [Burnout]
 
Messages
848
Location
Ohio
Nope, been doing it for four years, no problems.5W-30 M1 in the winter//// Pennzoil 10-30 spring summer fall. [ October 27, 2003, 11:19 PM: Message edited by: badnews ]
 
Messages
47,627
Location
Duvall WA - Pacific NW USA
BS. Myth. Switching will not cause spon bearings, etc OK Maybe in theory switching all over the map may be just tad hard on seals, supposedly with different shrink and swell rates. I even call BS on this. Don't sweat it. Next?
 
Messages
509
Location
Las Vegas, NV
Swithing back and forth between conventional and synthetic oil should not cause any problems. Is the GTP a Pontiac turbo? If so I would suggest using a fully synthetic oil. Turbos are just **** on "dino" oil! There was a really TERRIBLE UOA a while back on a VW turbo that had been filled with Pennzoil conventional 5W-30 and run for only 3,000 miles. [crushedcar]
 
Messages
342
Location
fairbanks, alaska
Been doing the same as badnews with Mobil1 winters and Pennzoil in the summers. Doing that system since '92. This year I am going with Chevron convention and sythetic.
 
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