I'm one to talk as I haven't done anything with mine yet. I can't see how it's possible to stipulate an exact time or regime for this because there are so many variables. Like, mileage, garage conditions, temperature when it's parked up and when it's out etc etc. I'm guessing the more you do it the better. If you have a real good look at the underside and there is absolutely no sign of it degrading at all then I'd think it's ok because if it's on there it's doing the job. Maybe have a stricter program of checking it perhaps every six months then you can see how it's coping. And have a really good look once a year when it's up on the ramp having its mot. You could even photograph it to compare.
Ozziedog,,,,,,,, must do mine too :lol: :roll: :lol: