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I can understand the need for a low W number in cold environs but with a functional thermostat doesn't the operating temperature of a water cooled engine stay pretty constant? I have used nothing but 10W30 oil year around in Southwestern Pennsylvania in all six family Saabs since 1986 with no problems. SAE 50 weight oil seems awfully thick to me. Would not stirring such stuff lower mileage and create more heat as well?
posted by 151.201.115...
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