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Re: buick regal oil cap
Buick Regal Oil filler cap unscrews all the way out and does not
"half-twist". It's just stuck. You may want to buy a replacement (about
$4) before applying more force or tools to it, just in case it's
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It depends on how much oil and how long the engine ran if any. If you put in 2 quarts too much but did not start the engine, no worries. if you put in 2 quarts too much and drove it for 50 miles, you could have damaged some seals and they may start leaking. Odds are you did not damage anything internally.
You have leaking engine cylinder head gaskets, this may be the cause of the overheating or a result of it, replace the head gaskets and have the radiator cleaned by a by a radiator repair shop, that should cure the problems.