Buick 1993 Skylark Owner's Manual page 224

Engine Oil
It's a good idea to check your engine oil every time you
get fuel. In order to get an accurate reading, the oil must
be warm and the vehicle must be on level ground.
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The engine oil dipstick is located directly behind the
engine fan.
Turn off the engine and give the oil a few minutes to get
back down into the oil pan. If you don't, the oil dipstick
might not show the actual level.
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