Brand New GMC 3.0 with bad oil leak

Sierra 3.0 · April 17, 2020

So, I just bought a brand new 2020 Sierra SLT with the 3.0 Duramax. I drove it home last night from the dealership. It had around 200 miles on it when I picked it up. I drove it all day today and put about 100 more miles. The odo shows 316 miles. I parked it on my concrete garage pad and went into my garage and saw fresh oil on the garage floor where it had been parked. I looked under the truck and saw it dripping oil onto the garage pad. Then I saw another spot where I parked it yesterday for a short time, again more oil. I look under it and saw oil coming from somewhere above the oil pan but could not pin point the area of the leak. I then checked the oil and there was only a small oil mark at the very tip of the dipstick. I have to assume it's been leaking since it was built. There were no warning lights and it seems to be running fine. I did notice that the engine oild monitor showed only 75% life left? The dealership was already closed for the day. Any suggestions? I dont think I want a brand new truck that's been run dry of oil. Should I ask for a new truck or should I have this repaired and take the chance of future issues?

CamGTP · April 17, 2020

It still has oil in and so it hasn't been run out of oil yet.

Stop driving and call the dealership in the morning. They should come and pick it up on a tow truck because further driving could harm it.

They won't just give you a new truck, things don't work like that. You don't even know what's wrong yet so why would you question that there is a huge problem already?

Sierra 3.0 · April 17, 2020

It still has oil in and so it hasn't been run out of oil yet.

Stop driving and call the dealership in the morning. They should come and pick it up on a tow truck because further driving could harm it.

They won't just give you a new truck, things don't work like that. You don't even know what's wrong yet so why would you question that there is a huge problem already?

I just dropped a ton of money on a brand new truck....one that should be free of major oil leaks. I'm really upset. Would you want a brand new truck that has this issue?

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CamGTP · April 17, 2020

No, nobody wants a truck to leak oil.

You still have to look at it from was it is in real life. The truck hasn't blown up and it's not crashed, so why would a dealership just turn around and give you a new vehicle??

It could be as simple as a loose oil filter but without them looking at it, we don't know. I've dealt with more oil leaks on cars than I can remember when I worked in a shop. Small leaks spread oil around like crazy. Clean up is very simple with the right products, if done right you would never know something happened.

Mikedfw · April 17, 2020

Mine had an oil leak, it started about 4900 miles after my first oil change so was about to get a oil change anyway, they said that somehow the filter came loose. Not sure if it was a problem with the filter or the truck, but you might check that first.

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Sierra 3.0 · April 17, 2020

I am going to let them check it over. Its definately not the oil filter or the drain plug. The leak is somewhere above the oil pan. I could not see where it's coming from. It's just leaking a lot of oil. I will update when they tell me what's wrong. It's just incredibly frustrating to have a new truck with 300 miles on it and having a problem like this.

Colossus · April 17, 2020

3 hours ago, Sierra 3.0 said:

I just dropped a ton of money on a brand new truck....one that should be free of major oil leaks. I'm really upset. Would you want a brand new truck that has this issue?

You want guarantees. There are none. That is why there is warranty service. ****** happens during manufacturing. Or for all we know someone crawled under there while it was parked somewhere and loosened something in hopes it would piss you off and blame GM. (Not likely what happened though) Just because you encounter an issue doesn't mean you automatically get a new vehicle. NO matter how much you paid for the vehicle. Get it fixed, ask them to check for engine damage, get it documented I doubt there is any damage if you were still registering oil on the dipstick, even a little, its when the oil doesn't register on the dip stick that it gets low enough to set the oil light and by that time you do have damage in many cases.
Just let them fix the issue, and stop worrying about it. Don't make a big deal out of something until you know what happened.

1997SierraSLT · April 17, 2020

If there is no low oil indicator light popping up on the dash, drive it until the engine seizes up. Then you are guaranteed a new engine.

Edited April 17, 2020 by 1997SierraSLT

KARNUT · April 17, 2020

Let them check it out. I had two vehicles use oil from new and had a normal life. I realize a leak is different and can be fixed. Where the oil is on the stick depends on when you check it. Just being on the stick you’re probably fine.

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diyer2 · April 17, 2020

I wouldn't be a happy camper either.

But the reality is they will fix it.

Depending on what is wrong it's your decision where to go from there.

Don't expect a new truck.

I highly doubt there is any engine damage.

redwngr · April 17, 2020

Let us know what they find.

Sierra 3.0 · April 17, 2020

It's not as bad as I thought. I got the truck towed to the dealer and had them drain the oil with me present so I could see how much it had left in it. It still had about 5 quarts (it takes 7). The oil was clean. The are now figuring out where the leak is. I will update when they find out.

Sierra 3.0 · April 17, 2020

Turns out it's a seal that goes from the intercooler to the engine. The seal isnon order...should be up and running Monday. My dealer has been great!

topgear1224 · April 17, 2020

I just dropped a ton of money on a brand new truck....one that should be free of major oil leaks. I'm really upset. Would you want a brand new truck that has this issue?

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wait what intercooler seal?