Mixing M1?

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I hoarded a close out a while back.I have old Tri syn and SS versions.Can these formulas of the same viscosity be mixed with no adverse effects? I am thinking of using for winter then going back to Dino. RichR
 
Mobil 1 and Amsoil are compatible with each other, dino oils and other viscosities of each brand. Mobil 1 in particular is fully mixable with each viscosity and Amsoil is too however, not all Amsoil viscosities use the same chemistry so extending drains is not recommended.
 
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