Dana

I know several people who have had good luck with the lockrite in on highway with moderate to heavy off road usage and on asphalt circle track. Extreme usage will eventually break or wear out most of the lunchbox units, as it will also break the supposedly unbreakable detroit locker. With street tires and road usage, just use a good synthetic gear oil and keep it changed enough to keep it clean (not black and stinking) and it should be maintenance free. Lockrite recommends the heaviest oil available for your temperature range to buffer the positive action, my off road friends use Lucas HD 85W-140 conventional with 25% Lucas, the lucas synthetic oil treatment should work well with synthetic Valvoline 75W140.