You don't state where you live, but I would think 10-40 would be a little stiff in the winter, unless you have an oil burner. I use 10-30 year 'round.
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'89 LX 5.0 - 5 speed. Original Owner
'94 E-150 4.9 Hi-Top Conversion Van
'06 Mustang V-6, 5 speed
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