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i bought a sled used and there was oil in it and was wondering when i go to top it off can i mix oils like syntheic and regular oil will it affect it
 

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Mixing oils can be done. In a perfect world, you should drain the system, then refill with the new oil, but we don't live anywhere near perfect. If you are going to be using a different oil, run the current oil until it is about out, then fill with new stuff. If you use Cat oil, make sure it's APV, otherwise a synthetic should be fine for the powervalves.
 
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