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It depends on the climate you live in. The area that has colder and longer winter would demand a lower viscosity then those with a milder winter, Colder should have a 5-30/20 high grade and no more then 10-30 for the milder use Castrol high mileage for my older machine ads a little more life for the age.. Hope this helps..

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12y ago

What else can I help you with?