Hello. I have a 2005 Durango that the oil light is intermittemntly coming on and off (with the dinging), At idle is when it happens and if I idle up over 1000 rpms it stops. The guys at the Firestone Complete Auto Care diagnosed it as Oil Sending Unit, Rear Main Seal Leak and Valve Cover Leak. However, there is no oil left on the pavement (and this is new clean driveway) so shouldn't there be some evidence? Especially after being driven for a while and then sitting over night? Anyway my question is what kind of costs are associated with the rear main seal and the sending unit if I do need them repaired\replaced? Any temp fixes to try first - like Barr's Stop Leak? Thanks for the help!

Jeff