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We've had maintenance issues with our IR 50, 75, and 125hp screws but we run food grade oil that is nasty. 2k hour oil change schedule instead of 8k. The 75s I take care of have 25k hours on them, had all the hoses replaced once, getting replaced again with stainless braided. The 125hp doesn't like power bumps but its been relatively free of defects in all of its 19k hours. These all have a Air after cooler too.
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Jon
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