Just bought a 1995 Mercedes W202 C250 (2.5 inline 5, 20 valve) that is a beater to be honest but i frequently have to tow a trailer and from experience with other cars with similar engines, i'll have to drive with a lead foot and often drop a gear on the highway to keep up with traffic. The engine will probably run a little hotter and fuel consumption should increase by at least 30%. The usual choice is anything from a 5W40 to a 15W40 but should i up the viscosity to a xW50?
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