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Message: [QUOTE="truespode, post: 1480371, member: 29329"] As long as it is good quality oil it won't cause the squealing. Something is rubbing that shouldn't be and not getting enough lubrication or air is flowing through something creating the sound. I've ran Rotella in my CRF's back in the day and Mobil 1 and all sorts of others with great results. Something happened on the rebuild that either is preventing lubrication from getting where it should or blocking off air flow of some sort or allowing air to flow where it shouldn't (maybe the exhaust is not installed correctly or piston in backwards (doubt that though). I wish I could be of more help. We have some bright people who have built a lot of race engines in the past (I'm not one of them) and understand engines at the design level but they don't stop in every day. I have a message out to who I consider the best of the best and hopefully he'll get a chance to take a look at the thread soon. [/QUOTE]