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Lower octane will also cause you to get fuel and oil in your valve covers. Due to lower octane levels, your mixture will prematurely fire and/or misfire, sending oil and gas into your valvecovers and intake plenum. I ran regular gas for one month once and ended up paying $400 having new headgaskets put on. You can sponge out the liquid goo from your plenum by taking the plenum cover off, but be sure your motor is completely cold. Otherwise, your plenum-cover gasket will warp and mishape if you remove it when its hot because it will cool faster than the engine. Just throwing this out there. goodluck
 
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