M1 or PP 5W-30 is all you need, winter or summer. Period. Mixing two different brands of oil to achieve some mythical optimal viscosity strikes me as madness.
Originally Posted By: bigt61
M1 or PP 5W-30 is all you need, winter or summer. Period. Mixing two different brands of oil to achieve some mythical optimal viscosity strikes me as madness.
My dad has a '07 Si and we run whatever is on sale. M1 5w-30, PP 5w-30, etc.. how much make up oil are you adding between changes. We live in NJ so we get how summers and cold winters. We add easily 1 quart between 1000 miles.
Originally Posted By: iluvhonda
My dad has a '07 Si and we run whatever is on sale. M1 5w-30, PP 5w-30, etc.. how much make up oil are you adding between changes. We live in NJ so we get how summers and cold winters. We add easily 1 quart between 1000 miles.