HELP!! oil leaks under passenger side of my 93 bonneville
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From: In your garage, swipin' da lug nutz
It would help to know what ya got under the hood 
It could be ANY or a combination of the following:
Valve cover gaskets
Oil pan gasket
Oil drain bolt/bolt o-ring
Oil filter o-ring (not likely, but possible)
Oil pressure sending unit (again, not likely but possible)
Oil cooler lines (if you have a supercharged motor)
EDIT:
Could also be timing cover gasket, front oil seal, rear main seal.
Are you certain it'* engine oil? Transmission fluid and power steering fluid, if not changed since...uh, who knows...will look alot like engine oil too.
And Welcome to the club!!
It could be ANY or a combination of the following:
Valve cover gaskets
Oil pan gasket
Oil drain bolt/bolt o-ring
Oil filter o-ring (not likely, but possible)
Oil pressure sending unit (again, not likely but possible)
Oil cooler lines (if you have a supercharged motor)
EDIT:
Could also be timing cover gasket, front oil seal, rear main seal.
Are you certain it'* engine oil? Transmission fluid and power steering fluid, if not changed since...uh, who knows...will look alot like engine oil too.
And Welcome to the club!!
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From: Somewhere different on the globe every month....
You said oil - then the fuild that your seeing is brown
Does the leaking slown down, stop, or get worse when the car is running?
I am guessing what evryone else said and a possible loose oil plug
Does the leaking slown down, stop, or get worse when the car is running?
I am guessing what evryone else said and a possible loose oil plug
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Joined: Aug 2004
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From: In your garage, swipin' da lug nutz
The FIRST thing you need to do is degrease your motor from top to bottom. Before you can diagnose where a leak is comming from, you need to clean up all old evidence of leakage so you can spot where it is comming from.
Park your car overnight with a cardboard sheet underneath the engine, to make it easier to see where the oil is comming from and how much is actually leaking.
I would say the most likely culprits are the oil pan gasket, the o-ring for the bolt (or the bolt itself is loose), or rear valve cover gasket. Least likely is going to be the pressure sender and timing cover gasket, and "in-between" will be your main seals. Main seals will require extensive dissassembly (rear seal will require the motor to come out).
How many miles are on this motor?
Park your car overnight with a cardboard sheet underneath the engine, to make it easier to see where the oil is comming from and how much is actually leaking.
I would say the most likely culprits are the oil pan gasket, the o-ring for the bolt (or the bolt itself is loose), or rear valve cover gasket. Least likely is going to be the pressure sender and timing cover gasket, and "in-between" will be your main seals. Main seals will require extensive dissassembly (rear seal will require the motor to come out).
How many miles are on this motor?
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Originally Posted by sandrock
The FIRST thing you need to do is degrease your motor from top to bottom. Before you can diagnose where a leak is comming from, you need to clean up all old evidence of leakage so you can spot where it is comming from.
Park your car overnight with a cardboard sheet underneath the engine, to make it easier to see where the oil is comming from and how much is actually leaking.
I would say the most likely culprits are the oil pan gasket, the o-ring for the bolt (or the bolt itself is loose), or rear valve cover gasket. Least likely is going to be the pressure sender and timing cover gasket, and "in-between" will be your main seals. Main seals will require extensive dissassembly (rear seal will require the motor to come out).
How many miles are on this motor?
Park your car overnight with a cardboard sheet underneath the engine, to make it easier to see where the oil is comming from and how much is actually leaking.
I would say the most likely culprits are the oil pan gasket, the o-ring for the bolt (or the bolt itself is loose), or rear valve cover gasket. Least likely is going to be the pressure sender and timing cover gasket, and "in-between" will be your main seals. Main seals will require extensive dissassembly (rear seal will require the motor to come out).
How many miles are on this motor?