With the rising costs of 91 octane no ethanol price of $4.29 as of today... wat is everyones thoughts regarding oil. I've been using Yamalube ($31.99/gallon) juss for the simple fact that I've been told by Kurt that this is the particular oil that had been used previously with this motor. Juss wondering if anyone uses penzoil or less expensive oil and have had any problems directly related to the type of oil being used. My motor is premix and been using 50:1 and have gone through a gallon in 3 weeks so far. Getting pretty expensive to run.