Oil leak leaking from behind oil pan found a small hole in pan dont know if a plug fell out oil covers entire dip stick when last checked brownish yellow colour

Dripping is not a good sign. That could be a lot of oil being lost, the usual places to check are the oil pan plug and filter to make sure they are not loose. If they are not leaking then you need to start checking gaskets on the oil pan and valve covers, dip stick and oil cap, and sending unit. If they are not leaking then you are looking at main seals inside the engine.

Pull the drain plug, change the oil filter, replace the drain plug. Add oil until the dipstick reads full. Start the engine and make sure the oil light goes out. Check for leaks around the oil filter with the car running. Recheck the oil level, add as necessary. Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

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well it could be several things like pan plug seal cracked, oil pan leaking, rear main seal bad, front engine seal bad, head bolts not properly torqued, head could be cracked, but I would start with the oil pan drain plug seal and work from there.

the thing you found is a plug that the factory has installed into the dip stick hole wile assembling the car, when the dip stick tube is installed they just push the plug into the transmission oil pan and leave it there it cant hurt anything, so when you service the transmission for the first time you find the plug and throw it away it is not needed, don't feel foolish you would be amazed at how many times i have been asked this question.

An oil leak can come from from several different places.

It could be from a valve cover, oil filter, oil pan, dip stick, oil drain line, oil pump, and a few other places.

I'd try to see where the leak is coming from first. Clean your engine bay and grab a bunch of lights.

Light up the engine bay and see where the leak is coming from. Once you find the leak, you'll know what to replace.

Replacing everything is just spending needless money. I'd also suggest checking to make sure you're not over filled.

YOUR TRANSMISSION DONT HAVE TRANSMISSION DIP STICK YOU HAVE A LEVEL CHECK PLUG ON BACK SIDE OF OIL PAN YOU NEED A SCREW DRIVER TO PRY OUT LEVEL CHECK PLUG.WITH ENGINE RUNNING FLUID TEMPERATURE 95 TO 113 DEGREES. IF FLUID COMES OUT SMALL DRIPS FLUID LEVEL OKAY.IF FLUID POURS OUT CHECK HOLE YOU HAVE TOO MUCH FLUID IN TRANSMISSION. IF NO FLUID COMES OUT CHECK HOLE.ADD A PINT OF FLUID AT A TIME SO YOU WONT OVERFILL TRANSMISSION. YOU NEED A NEW CHECK PLUG O - RING. IF YOU REUSE THE OLD O-RING YOU WILL HAVE TRANSMISSION FLUID LEAK.DONT REMOVE CHECK LEVEL PLUG UNTIL YOU HAVE PLENTY TRANSMISSION FLUID ON HAND AND A NEW CHECK PLUG O- RING THE DEALERSHIP HAVE IT.

DRAIN OUT EXTRA OIL.PUT THE RIGHT AMOUNT OIL IN.CADILLAC 4.6L ENGINE WITH NEW FILTER HOLDS 7.5 QUARTS. THE CADILLAC 4.9L ENGINE WITH NEW FILTER HOLDS 5.5 QUARTS.TELL SON CHECK THE OIL LEVEL ON THE DIP STICK.DONT GO PAST FULL MARK. TOO MUCH OIL IN ENGINE CAN BLOW FRONT OIL SEAL.CAUSE PAN GASKET LEAKS AND FOUL OUT SPARK PLUGS.

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

could be rear main oil seal if it is not that oil galley plug u found

clean engine breather the pipe that runs into the air intake from the rocker cover