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Old 08-03-2019, 11:21 AM #1
pokeyman pokeyman is offline
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oil leaking from rear main

After switching to mobil 1 synthetic oil i develop an oil leak in my rear main seal. The truck does have over 200000 mile on it . I was wondering if any of you guys had the same problem after switching over to synthetic oil.
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Old 08-03-2019, 12:31 PM #2
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Could be coincidental. I switched over a few years ago with no leaks. My 96 has 250k and my 97 has 280k.
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Old 08-03-2019, 01:02 PM #3
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agree, I think it is a coincidence
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Old 08-03-2019, 01:45 PM #4
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Because synthetic oil does a better job of cleaning out sludge, it could remove deposits that are acting as seals when conventional oil was used.
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Old 08-03-2019, 02:22 PM #5
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Itís been said a lot here and Iíll gladly perpetuate it, but make sure itís actually your rear main seal and not just a leak in your valve cover or half moons.
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Old 08-04-2019, 06:13 AM #6
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Quote:
Originally Posted by HiLife View Post
Because synthetic oil does a better job of cleaning out sludge, it could remove deposits that are acting as seals when conventional oil was used.
Myth or old wive's tale, take your pick.
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Old 08-04-2019, 11:37 AM #7
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If you are sure it is the rear oil seal, try AT 205 additive.
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