Nissan 240SX/Altima 1993-1998 Repair Guide

Fuel and Engine Oil Recommendations


See Figures 1, 2, 3 and 4

All Altima and 240SX models are equipped with a catalytic converter, necessitating the use of unleaded gasoline. The use of leaded gasoline will damage the catalytic converter. The engines in these vehicles are designed to use unleaded gasoline with a minimum octane rating of 87, which usually means regular unleaded.

Oil must be selected with regard to the anticipated temperatures during the period before the next oil change. Using the chart, select an oil viscosity for the lowest expected temperature, and you will be assured of easy cold starting and sufficient engine protection. The oil you pour into your engine should have an American Petroleum Institute (API) designation of SG marked on the container. For maximum fuel economy benefits, use an oil with the Roman Numeral II next to the words Energy Conserving in the API Service Symbol.

Click image to see an enlarged view

Fig. Fig. 1: Look for the API oil identification label when choosing your engine oil

Click image to see an enlarged view

Fig. Fig. 2: 5W-30 is the preferable engine oil grade for all ambient temperatures. 20W-50 is usable if the ambient temperature is above 50F (10C)

Click image to see an enlarged view

Fig. Fig. 3: If the ambient temperature is below 104F (40C), 75W-90 is the preferable gear oil grade for the manual transmission/transaxle and 80W-90 for the differential

Click image to see an enlarged view

Fig. Fig. 4: The recommended engine oil label is located on the underside of the hood