Recommend engine oil

This is from the service manual

Engine oil

For Vehicles with Mercedes-Benz Maintenance System (FSS or FSS Plus) - U.S. Vehicles Model Years 1998 - Model Year 2004

Mercedes-Benz requires that you use only the MB-approved synthetic motor oils as listed in the charts below for all vehicles equipped with the Flexible Service System (FSS or FSS PLUS). Conventional petroleum-based oils must not be used for vehicles equipped with the Flexible Service System but may be used on older vehicles. If the engine oil used does not meet the above mentioned standard, engine damage is possible, which is not covered by the Mercedes-Benz New Vehicle Limited Warranty. The use of any oil additives is not recommended by Mercedes-Benz USA and may result in damage to the engine which is not covered by the Mercedes-Benz New Vehicle Limited Warranty.

U.S. Vehicles Model Year 1998 - 2003 Engine Oils

MB-Approved Synthetic Engine oil, MB Sheet 229.3
Castrol Syntec 5W-40
ELF Excellium LDX 5W-40
ELF Excellium LDX* 0W-30
Pennzoil Platinum European Formula 5W-40
76 Pure Synthetic Motor Oil 5W-40
Kendall GT-1 Full Synthetic Motor Oil 5W-40
Motul 8100 E-Tech 0W-40
Motul 8100 X-Cess 5W-40

*Not approved for use in AMG engines

MB Sheet numbers are printed on the outside of oil containers