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Charger SRT Hellcat
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Discussion Starter · #1 ·
I have searched for a rear main leak on this forum. Does not seem to be an issue. It seems there are few mentions of anyone have RMS issues and if so, rhe threads are old.

Well, seems I have a rear main seal leak. Long story short. I detected oil build up in the RMS area a year ago. Oil pan gasket replaced.
recently, when having the vehicle on ramps to clean wheels without removing, I noticed another oil build up as pictured.

Dropped off at dealer.

Assessment, rear main seal.
Has anyone had this issue or know more about a particular reason for it? Thoughts? Questions?
20210428_090606.jpg
 

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2020 Challenger Hellcat Redeye Widebody Indigo Blue with Graphics Package
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No man, sometimes these things just happen. Hopefully your still under warranty and it's not an issue.
 

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Charger SRT Hellcat
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What brand oil do you use? You may want to try switching brands first; seriously. Some oils seep a lot better than others.
 

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Discussion Starter · #4 ·
Thanks for the replies. The cat has 8,000 miles on it and still under warranty.
I have only used the oem recommended weight Penzoil. 0w-40.
 

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2020 Challenger Hellraisin Scat Pack.
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Had a RMS leak at around 20K miles in another car. The RMS was a "known" problem area. Had it replaced -- under warranty -- at 25K miles and the RMS was leak free when I sold the car with 317K miles.

Same brand different car and this car's RMS developed a leak. Had it replaced -- this time out of warranty. Do not recall the mileage but it was in the area of 100K miles. RMS oil tight when I sold the car with 161K miles on it.

While you can try another oil one with a lot of ester in it and this might cause the seal to swell and stop leaking that's not a guarantee. I read where the problem with running a high ester content oil is the seals swell some. If one switches back to an oil with less ester content the seals can shrink and then leak.

My advice is to get a high confidence diagnosis. For example you want to be sure the leak is not coming from above the RMS or is transmission fluid. In the latter case the transmission will still have to be removed but the leak in the transmission addressed.

In the case of the 2nd car with an RMS leak -- suspected leak -- the tech told me the seal could be leaking or there was one plug under the bell housing that could be leaking or the engine cases could be leaking. The engine was a flat 6 with with the two cylinder banks bolted together. He said the only way to know for sure was to remove the transmission.

As it turned out it was the RMS.

Note the recommendation is when installing a new RMS to not install it at the same place as the oil seal. The old seal can have worn a slight groove in the journal and if the new seal happens to end up at this groove it will leak. The new seal should be installed at a depth that has the seal on virgin crankshaft journal.
 

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I have searched for a rear main leak on this forum. Does not seem to be an issue. It seems there are few mentions of anyone have RMS issues and if so, rhe threads are old.

Well, seems I have a rear main seal leak. Long story short. I detected oil build up in the RMS area a year ago. Oil pan gasket replaced.
recently, when having the vehicle on ramps to clean wheels without removing, I noticed another oil build up as pictured.

Dropped off at dealer.

Assessment, rear main seal.
Has anyone had this issue or know more about a particular reason for it? Thoughts? Questions? View attachment 573084
Had the same issue with mine in the first 500 miles.
 
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