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Posted

I use Penzoil 10w 30w HD in my 218 48 Coupe because we do get nice and cold here and I don't want to change oil just because of the seasons. However, if you are warm all year round, you could probably get away with just straight 30w HD oil.

Posted

I leave 10w40 in my flatheads year round. However I don't start them in the dead of winter when its really cold.

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