Oil Leak 1999 Silverado 2500

[bluebrick]

I have noticed a very small oil leak on the ground after I park my truck for a short while. It is not a very big spot, but in any case it is definitely an oil leak. I checked the oil drain plug to make sure that it was tight and it was. Any suggestions on where else I might check? Also, should the oil drain plug have a metal gasket around it? Thanks.

[rileyjr16]

It should and there should be a O ring around it too. I have the same problem and I have replaced the O ring multiple times with no improvements. Probably the main seal thats giving me the headache and that might be your problem too since its an old truck.

[murdog94]

I second the rear main seal.. which after time with the Gms wears and seeps some oil

[bluebrick]

Is there a definitive way to tell if is the rear main seal or any other seal? Can you just look at it and tell?

[bluebrick]

What are some estimates for replacing the rear main oil seal on a 1999 Silverado 2500, 6.0 engine?

[BoneHead]

I wouldn't worry about it unless it gets bad. Besides, are you sure the truck isn't "marking it's territory" lol

[gnfshn283]

I had a small oil leak from my 1993 K1500 5.7 when I had it in for service I asked if they try to find the source for me .
The diagnosis was that the rear main was leaking a little bit but nothing serious , Common problem on high mileage vehicles
like mine. Less than a week later while at work one of my co-workers asked me what was leaking from my pickup, said
it had left a trail from the highway to where it was parked (3 blocks) . I went to investigate thinking I'd find a big puddle
of whatever it was but all I found was where the trail ended and it was oil . Checked the oil level it was 3 quarts low .
Put some oil in and started it up looked under the truck and found oil gushing from between the block and the oil filter adapter.
$5.00 for the gasket . could have been $5000.00 for another old truck .