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what is the difference between 20w 40 and 20 w 50 grades of engine oil? how does grades of engine oil decided for particular veh
By Manish 03 March 2009
Expert`s comment:

Ratings of lubricants are done according to standard temperatures . 20w40 oil is suitable for usage at atmospheric temperature of 40 degrees and 20 is viscosity index. Grades of oil is deermined and recommended based on the standard temperatures of the regions of usage of the vehicle.

Answer by Shiva Shankar 03 March 2009
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