unleaded...besides that don't waste your money on premium gas, the car's not worth it.
5 w30
R-134
DOT3 is recommended
A 1998 Oldsmobile 88 takes ATP automatic transmission fluid. This is sold in most places that carry transmission fluid, or you can buy it through a dealer.
The recommended oil for an Oldsmobile Alero is SAE 5W-30 oil. If you live in a state that does not get freezing temperatures, 10W-30 is acceptable.
The recommended fluid is dexron 3
any dex-cool coolant but you must make sure it say's dex-cool on it.
for my 2000 Chevy Venture I use DexCool. It is the ONLY one recommended by GM.
5W30 is appropriate and recommended for all but the most severe service in North American GM cars, 1999 model year.
in the far left hand side. right above where the belt is . it is kind of hidden just under the windsheild.
Depends on the model
2003 oldsmobile