There was a thread about a week ago on vacuum pumps. Yes there is a bit of oil or grease inside the pump to lubricate the needle * ball bearings the eccentric run on. There's not enough that it can tolerate much of a leak. The pump is held on with three capscrews You can get an open end wrench on easily. DO NOT follow the factory manual instructions to drain the cooling system & remove the radiator! Remove the whole pump after removing the serpentine belt and disconnect the air intake hose from the air filter box to the vacuum pump. Put the pump in a vice and use a power steering pulley puller tool to remove the pulley from the old pump. Take the three capscrews out of the old pump and install them IN THE NEW PUMP....put the new pump in the vice carefully....install the old pulley flush with the end of the shaft making sure the three capsrews are still in the new pump. Reinstall the new pump, tighten the three capscrews, connect the air inlet line, reinstall the belt. Same the hood and drink the last three beers out of Your six-pack! /ubbthreads/images/graemlins/grin.gif