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I lighten up on oil viscosity in the winter, But we can swing pretty wide here. It gets to as cold as -30 f with averages in January around -10. Then in the summer we push 100 pretty easy. So I do run specific for season.
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1994 Subaru Legacy Wagon
2001 Subaru Outback Wagon H6
1999 Ford SuperDuty
2008 Mazda CX9 G T
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