Post by
WDRacing »
https://forums.nicoclub.com/wdracing-u3125.html
Tue Jul 03, 2012 4:38 am
There should NEVER be metal on metal sounds. Best case, something is lose and banging against something else as the motor turns over, but with milky oil I'd say you're well beyond the best case scenario.
If the piston was seized the motor wouldn't turn over at all, unless the rod separated from the piston and is just in there banging around.
I'm 99% that you'll have to pull the motor for this diagnosis/fix.