Which Motor Oil for Modifed Mazdaspeed3?
Updated- April, 2024 A reader asks: “I’ve got a 2008 Mazdaspeed3 with the 2.3L turbocharged engine. My engine is modified to put out around 330 horsepower and 400 ft-lb of torque. On a Mazdaspeed3 forum (where many posters have similar mods), some use Shell Rotella T6 5W-40 diesel engine oil. Does AMSOIL offer an equivalent…



