Re: Mineral or Synthetic Oil ?
say 5w 40 ,
5 is the viscosity in cold and 40 is viscosity when its hot.
15w 40 , 20w 40 are recommended for petrol cars
15w 40 is best all the times .
same 15w 40 is the standard thing used in diesel engines.
Synthetic , its 5w40 practiced for all engines at present , 0w is for extreme conditions
price varies according to brands since they add few more chemicals/ additives added in them
And buying a engine oil from the usa , hmmm i feel not worth . lot of products are available for the car from the usa.