Things worked out fine! Photo from this morning.
Took my C7 in for an oil change Thurs. My regular dealer was bought out this past summer and this is the first time I had the C7 in for service with the new ownership. Drove the car the 35 miles home from the dealer with no observed issues. Took a spin on Saturday and noticed a plume of gray smoke coming from the exhaust. It was intermittent and I only saw it twice. Drove the ten miles home with that "Oh-No" feeling. The car did not overheat, temps stayed normal, no anomalous noises or performance issues and no warning lights.
Figured it had to have something to do with the oil change. Started doing my "investigation" to figure out whats up. Dipstick showed overfill. I reviewed the oil change invoice and noticed that it might have been filled with 10 quarts rather than the correct seven called for. Compared prior invoices from previous dealer and concluded the car had received 10 quarts, three more than called for which amounts to @ 45% overfill. I concluded whoever changed the oil put the Z51 amount in rather than 7 quarts for my "base".
Looking at the consequences of that and my "Oh No" feeling grew. Like a blown head gasket, a damaged cylinder head, or a cracked engine block. Called the dealer but the service shop was closed. They weren't open Sunday so I had a day and a half to figure everything out and strategy to deal with it.
So today had it towed as shown in the photo back to the dealer. They expressed genuine concern. They agreed that they had overfilled it. They checked a variety of things including the PCV and intake for oil and all looked good. They corrected the oil level by draining some and leveling it out to the correct amount. No indication of any engine damage.
Drove the 35 miles back from the dealer with a "chase" car behind me to look for exhaust smoke as I did a variety of "exercises" with the car. No prob so I'm feeling OK at this point. The car was driven 104 total miles with the 3 qt overfill.
What. if any, issues should I keep an eye out for now that might indicate a problem?
Suggestions or comments on this incident? I realize my bad for not noticing the oil amount mistake on the invoice when I paid.
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