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Q: rear main seal leak on 1998 Oldsmobile Silhouette

What is the cost to fix a rear main seal leak?
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Basically you have to remove the Engine cradle and separate the engine from the transmission. this is going to be a 10-15 hour operation. the part is only about $20.
will bars leak rear seal repair stop me from losing oil only when i am in drive dont leak when onlt idling or in park
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