My Chevy 2002 Tahoe is leaking oil. They told me

Question moved from Misc to model category.

Diagram and videos

https://www.google.com/search?q=2002+Chevy+Tahoe+Engine+oil+pan+bolt+tightening+sequence

Check the intake manifold gasket. If it leaks it will draw air into engine and this air bypasses the mass air flow sensor which will cause a rough idle or running symptom from running too lean. If you change the intake manifold gasket you should probably change the valley pan gasket at the same time. A dealer will change both for less than $500 and you might save some more if you dig around on GM Service website and find a coupon discount (Usually 10%-20%). You might save more at a local shop if you trust them and they do this type of work. Getting to the intake manifold gasket also exposes the valley pan and since you are already there it only takes a little more to change that gasket too. Some GM V-8 engines use a little oil between oil changes and if both gaskets are meticulously changed at the same time it will sometimes fix the oil usage. It did for me on my Tahoe (126k miles).

If you have oil running down the side of the block (from above the oil pan) check the lower edge of the valve cover. Those gaskets often fail to seal when the fasteners eventually work themselves loose

Check the fasteners that secure the valve cover to the heads. Torque to 3 ft lbs.

If the leak persists... replace the gasket.

did you make sure to remove the old oil filter gasket before putting the new one on cause sometimes they stick on there,check your old oil filter if it has the rubber gasket on it or not,and drain 1 quart out of the oil plug if you put too much in or you will blow oil seals

it would have to be a very bad leak to cause a vacuum leak but that big you couldn't keep oil in it most parts stores will scan it for free in hopes to sell the parts to fix it

Hello....The first thing that you want to check..since you said the leak is in front is the area around the bottom of the crank shaft..If the oil is comming from there...This is where the main oil seal is for the crank shaft bearing...If no oil is comming from that area...you can breath a sigh of relief...There are a lot of stop leak products for everything from radiators to oil systems to transmissions...I'm not a big fan beacuse ...If it can stop a leak...it can stop the flow....The best cure for an oil pan leak is to drain the oil.....Drop the oil pan...replace the gasket...and if you do it right...you'll be good to go for a long time...PS.....don't forget to replace the oil....I hope this was helpful.....PEACE.....

I would perform a coolant pressure test because these engines are known for leaking intake manifold gaskets.Check and see if your oil is starting to turn a creamy tan color.

There are two gaskets, one is between the lower pan and the upper pan, and the second is between the upper pan and the engine. You only need to replace the gasket that leaks. If both are leaking, replace them both. To find out where the leaks are, raise the car, get underneath, and look closely all around the oil pans to see where the oil is coming from. Use a flashlight if necessary. You should be able to trace any leaking oil upward to its source.

The oil pan gaskets are not necessarily the only sources of oil leaks. Check to see if any oil is coming from behind the timing cover, and look for oil coming from the valve cover gasket.

oil pan, or rear mainseal housings are common leaks on these... also if 4wd, diff runs thru oil pan..

Worn gasket seal around pan, worn or loose oil plug, pin hole in pan, someone forgot to put back the oil cap are some suggestions that come to mind.