you may use 20W50,
if weather temp will be around 30*F to above 80*F
if weather temp is from around 40*f and going down to 0*F use 5w50 or 5w40
the higher the temp, the higher viscosity, for winter it should be lower viscosity
for your car, the age must be considered too.. if overhauling done already, with hot temp, use the 20w50, most japanese cars use that rating..whether turbo or not..
use conventional oil only with classification of SL, SM .. .somewhere that range. but no SD,
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