Hey forum,

I'm having some issues with my Oldsmobile'* 3.8L V6. It'* been a year since i replaced the head gaskets and the gaskets all over the engine, now it'* leaking oil. It makes a small puddle on the right side of the engine (the side where the serpentine belt located). I have to buy at least two quarts of oil every three days and it isn't cheap since it has fully synthetic oil. All oil pan bolts are tight and the oil filter is screwed-in tightly in place and it still leaks. Can anyone tell me where else to look because I've checked all places where leaks can occur.

Thanks,

Martín

Only other known place it could be coming from would be the oil pressure switch.

There is also a gasket under the plate that the oil pressure sender screws into which could not be sealing right. This is all right above the oil filter.

**UPDATE**

I replaced everything and it still leaks oil. It even smells of burnt oil after driving for an hour or two and it seems to come out from the side of the engine where all the pulleys are located and leaves a small puddle right where all the gaskets, seals and the switch. Before replacing the head gaskets on the engine, it didn't leak oil and now i have to buy a new can of 10W-30 every 3 days. Any ideas, guys?

You took the oil pressure sender out and the plate it screws into? That gasket was cooked on my engine pretty well and I had to spend some time on it with gasket remover and a scraper to get the surface completely clean, otherwise it doesn't seal right. Also, leaking that badly, you should be able to see some dripping if you can put it up on ramps and watch from underneath. That would help you verify the source of the leak.

I only replaced the Oil pressure sender unit itself. I didn't check the plate and I have a spare gasket that came with the oil pan gasket as well. I wasn't sure where it went so I saved it in my toolbox. That gasket is small and round with three holes: two on the sides that are the same size and one in the middle that is large. Do you mean that gasket for the plate?

Check the valley gasket between the LIM and the block. Often times the rubber / silicone gasket that comes in the kits doesn't seal very good and oil will pour out of that spot. A good cleaning and a nice thick bead of RTV when the LIM is placed back down does the trick.

This the next place I needed to check. Thanks, bud.

That'* what I was talking about, the gasket for the plate beneath the oil pressure sender.

Oh, sorry about that Tom. Do any of you guys have a diagram of the Buick 3.8L engine to aid me in finding the gasket?