Our 93 Warrior, which is bored and stroked to 436cc has an oil cooler which is plumbed into the oil filter,and mounted under the LH rear fender it feeds a cooler about 6"X11", it works great and cools the enigne about 40 degrees farenheit, if I measure just the cooler it only cools the oil about 5 degrees, but this is not the proper way to determine how much cooling you have attained, what we did was to run another bike through the same paces, and compare engine temps, the other bike was not bored and stroked and ran 40 degrees warmer.