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Check the build year, models prior to '80 it was 15:1
With the new synthetics, you can probably mix 30:1 But it must be "for pre-mix only" oil. Do not use prediluted oils for injector systems.
 

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i run synthetic race oils in my mod motors at 40:1
with todays oils, you don't need to run 15:1 like they did back in the day. lots less smoke too.
 
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