Will Sea Foam affect a main seal leak? [SOLVED]

Hi, I have a 2004 Nissan Maxima with a 3.5 V6 Motor, I have a rear main seal leak. Was wondering if this is going to cause any issues or worsen the leak? Also, I’ve put the sea foam in my oil but can’t drive the car right now. I’m taking it in the morning for a brake line to be fixed, is it going to be okay sitting overnight in the oil like that? Thanks

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Jim D.
Jim D.
1 year ago

Thanks for the question, Phoenix.

Sea Foam in the gas tank will not have any impact on the leak.

In the oil crankcase – possibly. Sea Foam will clean any contaminates out of the engine crankcase that could possibly be slowing down the leak. However, the crankshaft spins so fast that contaminates don’t typically have an opportunity to build up in the Rear Main Seal area.

If you’re okay with that, it’s completely fine to leave the Sea Foam in the oil overnight. In most cases, we recommend driving it 100-300 miles with the Sea Foam in the oil before you change it. That way the Sea Foam has time to clean and the heavier oil residues cleaned by the Sea Foam can be drained away with the old oil. In any case, Sea Foam in the oil overnight won’t hurt anything.