just bought 2001 tracker nitro was on lake pulling tube,everything seemed to be good then stopped to change riders,one of my boys said they herd a squeaking noise from lower unit i couldnt here anything but felt lower unit and it felt warm like from normal use is it typacal for it to be warm? we were running it full and medium throttle for at least 10 minutes.We took it home dropped lower unit oil all looked good and replaced. Oh its a 125tracker by mercury 2stroke oil injected.thanks 
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