GM 6.0 oil leak

Update:

After 1 week of driving with the dye, oil only reappeared on the filter just like most of us expected. They claimed the filter was tight when first checked and was still tight today. They are making an assumption that the filter didn't seal for some reason such as warping of the filter or manufacturing issue or such. The filter was replaced and will be rechecked in a couple weeks.

I really hoped that it was a filter or installer issue and feel that was indeed the problem. I don't expect to see any oil when rechecked later.

I don't like GM products at all, but my FIL has a 6.0 in his 2500 and my friends dad has a 6.0 in his 2500. Both are work trucks and worked pretty hard. FIL uses his truck to tow a camper too. Not a single issue with either engine, no leaks, no nothing. The 6.0 seems like a very well designed and durable engine.

My guess would be that this is caused by the oil change. Let us know what they tell you.

I have an appointment for 1PM tomorrow for a recheck with the UV light. Lets hope for just a filter leak!

CampingN.C. wrote:
Did the oil leak start only after the oil change? Cross threaded drain plug maybe.

???????????????Can't really say for sure. It was changed 6 weeks ago and the garage has had its share of snow, salt & general crud on the floor. Last weekend it was in the forties allowing me to hose out the garage and find the spot. I do know this is the first I've had oil on the floor and I do clean the floor anytime it is warm enough.

Not a 6.0 but a 5.3, I have a '08 impala SS, while under extended warranty I had the dealer do all the service,Since day one I always had a small leak that left three or four drops of oil under the car and before the warranty expired I took it in for the leak,, said they could not find a leak but cleaned it off and to bring it back in a week,,(must have put the dye in). Went back in and they said it was the oil drain plug gasket and gave me one to take home,(told them I was going to do my own service), Changed the oil and found that the filter was barely tight,, I mean I really didn't have to put any force on it to spin it off!
I put a new filter on and used the filter wrench to give it 3/4 to 1 full turn after hand tight!

Has not leaked since!, I only have 35,000 on it and will do the same again at next service..

As said before, the filter is about halfway surrounded by the oil pan. I am young enough I can hand tighten mine (2012 2500hd). No oil leaks though. My bet is a loose oil filter also.

Twice I've had the filter on my 2012 Sierra leak. The first time I was on the road and camping. I was able to hand tighten it myself and continue on the trip without it leaking more. The second time it happened, it was the day after I had an oil change. I took the truck back and they put on a new filter, made sure it was tight and all was good.

I work on 2011-2014 Tahoe Police vehicles and I have seen quite a few of them that are leaking from around the oil filter. The oil pan surrounds about half of the filter making it difficult if not impossible to hand tighten. A lot of our Vehicles are taken to a national oil change place and these are the ones that come in leaking. Unfortunately to get them tight enough one must use the oil filter wrench, which is opposite of what is taught and what is written on the oil filter box. Your 6.0L may have the same type of pan.

Did the oil leak start only after the oil change? Cross threaded drain plug maybe.

Get a black light and you can check it also, I use dye on my own vehicles and have the special light and it is great, also have dye for tranny, coolant and fuel.