I recently discovered "the catch" with the free oil changes I get from Heninger... I took my truck in for it's 16,000km oil change and they told me that I have to rotate the tires and do a couple other things. Should be about $100 for these things. I ask him how much they're charging me for the tire rotation and he told me either $20 or $40 (can't remember). So I said that I'd do it myself. Then he tells me that unless Heninger does ALL my service work, I lose my free oil changes.
So yeah, I'm not allowed to rotate my own tires. And I just got a new compressor that I'm dying to use!!