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Tech Forum : Synthetic Oil Causes Leaks?

- BMW E21 Community
   - Tech Forum
      - Synthetic Oil Causes Leaks?
  Posted Tuesday, Oct 24th 4:45am [Edit] [Quote] [IMS] [View car]

Post nr. 3


Does Syn Oil cause leaks in motor/trans/differential?

My car has been very badly taken car of before i bought it, i am "shotguning" it right now, fixing everything i can think of. Ive been changing the oil obsessivly and just recently changed the trans and diff fluid. Before changing them this last time, i had the trans fluid leaking slowly, aswell as the diff fluid leaking abit onto the fuel filter. I put some motor sealant stuff in the engine and the small oil leaks have stopped. However, I would like to try synthetics on all 3 of these places, would they just make the leaks worse?(they all seemed to have stopped)




  Posted Tuesday, Oct 24th 5:51am [Edit] [Quote] [IMS] [View car]

Post nr. 902


Synthetic oils tend to remove sludge. Often times sludge is what is stopping an oil leak. This means a synthetic will often make leaky seals worse.

There is a theory that says it just takes a little while for the sludge to disperse then the seals will hold oil again. I don't really think this is true but you never know. I think if a seal is leaking you can just replace it with a good seal and fix the problem.

jamie

  Posted Tuesday, Oct 24th 1:06pm [Edit] [Quote] [IMS] [View car]

Post nr. 102


I have been using syn oils on the engine, gearbox and rear diff for the last 20 years and I don't detect any leaks. Ground is dry every morning.


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