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...Why would getting a little oil on the isolator be bad? Wouldn't a drip or two of oil help keep the rubber soft as opposed to dripping gas on it that would dry it up prematurely.
Contrary to what you might think, getting oil on the isolator is NOT GOOD! The oil will eat away at it and destroy it. If you do get oil on it, clean it right away and clean it good. There are many methods (tricks) mentioned on how to keep oil away from it when removing the filter.