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Couldn't Unscrew Oil Pan Plug


MAC

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I spent almost $100 for an oil change because I couldn't remove the oil pan plug. I even applied some heat and it still wouldn't budge. I had 4% oil life left, so I brought it to a dealership and had them deal with it. They replaced it with a plug I bought. Is this a common problem? The last time the oil was changed was at a Cadillac dealership before I bought the STS. Luckily no stripped threads.

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Retorque it now, so you have no problems later, this is very odd, does the bolt have a seal in it?

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Someone put it back on the a 1000 ft/lb impact wrench.

1000 ft/lb?! I think you're probably right. :blink: The new plug has a rubber seal so that should help keep it from seizing again.

I had just bought 10 qts. of Mobile1 0W-30 and an extended life filter for $50 and thought I had a good plan to take care of the oil change over the weekend. Unfortunately, the plug wouldn't budge. I'll run what the dealership put in and put the Mobil1 in next time.

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Someone put it back on the a 1000 ft/lb impact wrench.

1000 ft/lb?! I think you're probably right. :blink: The new plug has a rubber seal so that should help keep it from seizing again.

That gasket can be damaged easily if the plug is overtorqued. If it happens you will see drops of motor oil on the ground right under the plug.

The saddest thing in life is wasted talent

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I was surprised that the factory procedure actually calls for removal and replacement of the oil plug gasket with each oil change. That's not something I do when I change the oil.

Install the oil pan drain plug and NEW O-ring seal.

Tighten the oil pan drain plug to 20 N·m (15 lb ft).

Also, for the CTS 3.6L with the oil filter cartridge, the oil filter cap threads are supposed to be lubricated with engine oil:

Lubrication must be applied to the threads of the oil filter cap prior to installation. Failure to lubricate the oil filter cap threads can hinder later removal and cause possible oil filter cap damage.

Lubricate the oil filter cap threads with clean engine oil.

Bruce

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It's only common because so many so called mechanics feel the need to muscle the plug. I just give it a twist with my wrist to tighten it with a short combination wrench, and in over 30 years of changing oil I never had a plug come loose.

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