Not making any suggestions one way or the other, but had an anecdote to pass along regarding Amsoil Dominator Racing Oil.
I had a conversation with Amsoil about this oil for a different application a few years back. At that time I was informed that it did not contain a corrosion inhibitor package like those used in their more conventional oils and for that reason should not be used in an engine that might be stored for an extended period of time. The recommendation for this oil was to use the engine for the racing event, then drain oil and refill with fresh oil. This is a recommendation I’ve seen made by other oil vendors for their racing oils.
Although ZDDP is often cited as a corrosion inhibitor in its own right, the Amsoil tech made no reference to this and simply cautioned about storing an engine containing their Dominator oil.
In the link below Amsoil calls out their oil products that are specially formulated to contain a “robust rust and corrosion inhibitor” package, and I've cited the specific products in
red font passage below.
http://www.amsoil.com/newsstand/motor-o ... -vehicles/
"AMSOIL Synthetic Motorcycle Oil, AMSOIL marine engine oils, AMSOIL Z-ROD® Synthetic Motor Oil and AMSOIL Formula 4-Stroke® Synthetic Small Engine Oil contain robust rust and corrosion inhibitors. They deliver outstanding performance for your engines when you’re driving, and superior rust and corrosion protection when they sit idle.
