GMC Troubleshooting Questions? Ask a Mechanic for Answers
did they say what area it was leaking in ?
and they are sure its engine oil ?
its very hard to assume where it is coming from'
the best bet is to clean off the oil and add some oil dye to the engine oil and drive it for a few days then shoot the engine with a black light to look for the dye leak area
this can be an oil pan gasket or rear main seal or timing cover or front crank seal leak as those are the most common oil leak areas under these trucks for engine oil
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how are you making out ?