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I too have been using the 5W-40. Has anyone actually email Amsoil to ask them why the switch? I used to use a 20W-50 in the summers on my SPG with 250+ kms on it but not sure the Viggen is ready for that. 5W-40 seemed like a good compromise...
I'd like to know more about Amsoil's rationale???
posted by 67.68.19...
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