The 1999 Oldsmobile can use any SAE certified motor oil. The manufacturer recommends 10W-30 weight motor oil. Extreme climates can use a heavier motor oil.
i have a 4cylndr 99 old alero gx and it requires 5w30
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5w30 year round
It takes 5-30 oil weight and rated SM
5 w 30
I use 5/30 synthetic oil for my 99 C230 Kompressor, and 03 C240
5w30 engine oil, Mopar ATF+4 trans fluid.
You can use Mobil 1 10 30. Any 10 30 oil with a starburst symbol on it can be used for this type of vehicle.
Says it on the oil cap.
5w30
According to the 1999 Ford Expedition Owner Guide ( 5W-30 )