My engine oil light came on. I got the car towed to a mechanic. He checked and told us that there is a valve that prevents all the oil from runnng to the bottom of the engine when the engine is shut off. It is stuck and now there is no or low pressure in the top end. The car isn't worth the $1400 he wants to charge to probably rebuild it. There isn't any engine knock YET. I am wondering if there is a way or something to add to the oil to possibly get this unstuck. Otherwise another Malibu engine (the second for this car) bites the big one. Any help would be appreciated. Thanks.