Thats strange, cause the Rotella oil, was causing the cranks to go out on the 450R race quad engines. Something about the oil bubbling after the pump & the crank getting half the oil it needs to maintain a cushion.
This was on Hondas though.
Just seen your reply & seen you have a 250.
What ever you do, dont mix different coolants, find out what is in the cooling system before you add any extra, because if you add the wrong type it could cause the coolant to turn to slime & then once the engines hot it will turn solid & she wont live long after that.
Dont know the type of coolant used that will cause this problem, but I've seen the results from it & it can be costly & quite a bit of down time.
Neil
