oil leak, what is the cause?
Most of the time it's a bad gasket. Can be from the Oil plug, oil pan gasket, lower intake gasket, etc. You'll need to get under the vehicle to diagnose.
how much to fix?
Find out where it is leaking first and I'll estimate it for you. A leak oil plug is close to nothing, to taking the engine apart can be big money. If you going to that extent, have your local mechanic diagnose it for you and give you an estimate.
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