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What will happen if you change the type of motor oil from say..5w-30 to 10w-40?? 200

posted by  someone claiming to be patrickofmtl on  Tue Feb 8 09:54 CST 2005 [RELATED]

my 240 has 400,000 kms on it, a few years ago in the summer the oil light would flicker at idle and the oil pressure gagae on my dash would read really low. I started using 20W-50 during the summer after that and the pressure is better. In the the winter i use 10w40. The reason manufactures use the lightest weight oils is that they improve fuel efficiency as they are easier for the the engine to pump and rotate.






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