I think Bulldog is our Amsoil dealer. You should be able to just top-off with Amsoil and be fine. I recently switched from VES II to Polaris Premium Blend and I just topped it off. If you want to be sure, just mix some VES oil and some Amsoil in a small bowl and let it sit overnight. If when you check it the next day you dont see any sludge, you are good to go. If you do see sludge, run it down as low as you can and then add Amsoil.
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