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Originally Posted by 89tracerman
royal purple is a syntetic oil and it works fine on RX7's you should also specify what is a pre mix.
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Pre-mix: mix motor oil and fuel so that they can be injected into the chambers at combustion time. It is advantageous because the rotary burns a little oil by design. You can remove the OMP to do this, but its not always necessary.
http://www.nopistons.com/forums/inde...T&f=65&t=14446