Thread: 15W40 Vs. 10W40 Pro's/Con's, Which ones BETTER?
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Old 06-10-2006, 12:23 AM
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Hatterasguy Hatterasguy is offline
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If its synthetic like Amsoil run it 6k miles and have Blackstone test it. You may be able to go even longer. Typically with lots of highway use we can run about 7k on our old diesels.
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