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Hi all:

Unmodded high-mileage (180,000+) '94 V-6 beater car (i.e. no budget for major repairs) is leaking oil. I've scanned the forum and not seen these specific symptoms described, so here goes:

I removed the underside splash shield to more closely inspect the problem, but I don't have a lift or jacks handy to look way up under the engine right now. However, the leak seems to start after firing the engine after sitting overnight (strangely not it seems after sitting all day at work) where it will push out about, oh, 1/4 quart onto the ground around the oil filter (it drips around and from the bottom the filter) and then stops after about 2 minutes of idling. This is with the oil level starting at "F" on the dipstick. Can't tell if it continues while driving, but I think it might not.

The oil filter is tight. It sounds like it might be leaking around the oil pressure sender from what I've read, but since I can't see up under the engine I'm not sure. I'd like to pin this down as well as possible before moving forward based on what I know, so any suggestions would be appreciated. Also, if the oil pressure sender is the likely culprit, is there a link to detailed instructions for its replacement?

Thanks in advance!

Oil pressure sender leaked in my engine too - it was an easy enough replacement - take off the filter and you will have a bit of room to put a wrench on the sender. The sensor itself cost like $10 or so (i think) at a local parts store.

I have also had a case where an idiot from jiffy lube didnt remove the rubber seal from the previous filter before putting a new filter on - and it dumped oil out like you describe....

You may also have a crack in the oil filter threads due to some idiot over tightening the filter at some point - if that's the case then you're SOL

shameem wrote:Oil pressure sender leaked in my engine too - it was an easy enough replacement - take off the filter and you will have a bit of room to put a wrench on the sender. The sensor itself cost like $10 or so (i think) at a local parts store.

I have also had a case where an idiot from jiffy lube didnt remove the rubber seal from the previous filter before putting a new filter on - and it dumped oil out like you describe....

You may also have a crack in the oil filter threads due to some idiot over tightening the filter at some point - if that's the case then you're SOL

shameem makes a great point, if you use a cheap filter or a wuick lube like oil can henrys or jiffy lube they have messed up a lot of stuff. i bought a "premium" filter k&n and it was rubbish! the seal would not do it's job and actually seal i replaced it twice same thing and i put back on a wix brand (napa, carquest, auto value) and never a problem since, get out a stock jack and lift it up and see if you can trace the leak.

mine leaked one day and it lost most of the oil. Just replace it asap before you lose the engine.

Thanks for the feedback everyone. I've not seen an oil leak like this before. It only happens right after the engine is started after sitting overnight (12+ hours); it will lose about 1/4 quart while idling for two minutes then stop. I'm assuming it's stopping anyway, since if it continued at that rate it would lose all of the oil very quickly. I've seen oil leaks start under pressure, but stopping after oil pressure builds up? Weird?

it sounds like a seal or something, extremely weird....ummmm, have you check to see if you pcv valve is working, cause if it's not it causes backpressure in the motor causing seals, dipstick, and other things to start popping out and leaking, just another thought

You may have a small crack (either on the block or the rubber seal) that expands and seals when the engine gets hot -