225 slant head torque

In my day job (aerospace), bolt torques are critical. I recall a study that found putting oil on the threads and under the bolt head does not change the tension you get at a given torque, but it does make it more reproducible. Thus, a little oil is good. Do not pour oil down the bolt holes or you risk "hydro-locking" and getting a wrong torque. Coating the threads with a high-pressure dry lubricant like molybdenum disulfide decreases the torque needed get the same tension by about half. Thus, don't grease the threads, especially w/ moly grease or you might yield the bolt trying to get the desired torque. Also smart to chase all the threads w/ a tap and blow out the holes. You can spray WD-40 down the holes if you blow most of the liquid out. You want to get rid of any rust.