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Just when I think everything is fixed on my 89 RC, something else pops up. Doesn't seem to be a particularly reliable vehicle with only 105k miles... This time it's a rear main leak. I know I'll have to replace it eventually, but in the mean time I just want to slow it down. It leaks about a one inch puddle every time I stop. I'm running synthetic 10w30. Will thicker 40 weight oil with some rear main stop leak additive help out? Thanks.
 

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The "high mileage" oils have extra additives in them to soften seals & gaskets to help with leaks. You might try one of the various brands at your next oil change, might not work but it wouldn't cost much to try.
 

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Mopar oil leaks that disguise  themselves as rear main...


1.  Oil pressure sending unit.  Back of block, leaks oil  drips down rear of engine looks just like the rear main

2.  Rear  of intake manifold, can leak if the seal is gone or just worn out.

3.  O-ring on distributor shaft worn, missing or broken.


Don't forget on our Mopars, oil leaks serve three purposes.

  1.  It stops dripping, time to add oil

  2.  Rust proofs the  under side of the truck

  3. Serves as a "Hansel and Gretel" type homing aid for your truck.


Cheers


Chris
 
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