Can I use mobil 5W-40 synthetic oil instead of 0W-40? I usually shop at Costco, and it's hard to find 0W-40 synthetic oil at Costco. They only have 5W-40 or 10W-40. Can these two types of synthetic oil comply with MB? Please advice.

YES! That is the same weight oil that I use in all of my cars!

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

At the very worst, 5W-40 oil will cost you a bit of milage. As far as lubrication goes, it's probably better.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!