1996 Oldsmobile Achieva Owner's Manual - Page 235

What Kind of Oil to 1 Oils recommended for your vehicle can be identified by looking for the "Starburst" symbol. This symbol indicates that the oilhas been certified by the American Petroleum Institute (API). Do not use any oil which does not carry this Starburst symbol. 3.1L Engine The 2.4L engine oil fill capis located on the passenger's side of the engine. The 3.1L engine oil fill capis located in front of the engine, behind the fan. Just fill it enough to put the level somewhere in the proper operating range. Push the dipstick all the way back in when you're through. If you change your own oil, be sure you use oil that has the Starburst symbol on the front of the oil container. If you have your oil changed for you, be sure the oil put into your engine is American Petroleum Institute certified for gasoline engines. You should also use the proper viscosity oil for your vehicle, as shown in thefollowing chart: