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Will Mobil 1 High Mileage Help or Contribute to Leaking Seals
 
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Question:
Will Mobil 1 High Mileage Help or Contribute to Leaking Seals?
I am considering using Mobil 1 High Mileage in my 1995 Dodge Ram (125,000 miles). It has been well maintained, but it does have a tiny rear main seal leak. It doesn't change the level on the dipstick; I just see a spot on the garage floor once in a while. Is it still Ok to use it? Or will it leak a lot worse? I heard that cleaning out deposits may actually help seal the leak?
-- Joe Young, Minneapolis, MN
Answer:
With seal leaks it is a little bit of a roll of the dice. If the seal has just shrunk, the seal swell additives in Mobil1 High Mileage can actually help re-swell the seal and help to reduce or stop the leaking seal. If the seal is damaged or worn, then it will continue to leak and will get worse with time.
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