Amsoil makes a fine oil.
1-I assume you are NOT talking about using the straight weight 40 oil in the Box.
That is a no-no.
2-Amsoil makes two versions of its oil. One is a G3 syn and the other, a G4. If you buy, makes sure you buy the g4 and in the appropriate weight.
For my money, Red Line is the best out there.
5W-40 is the deal.
Good luck.
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Rich Belloff
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