Purely guessing, I would say that the improved ventilation and cooling with the larger access hole in the bellhousing would help keep the rollers in a more reasonable temperature range, no bad thing. I would also say that the silicone lubrication helps. The rollers I have seen that have broken up (my own included) look like they were torn apart rather than just worn away. Again I would guess that the silicone lubricant helps prevent this as it is difficult to tear something apart if you cannot get hold of it.
With both of these working for longer life of the Centa rollers and the fact that if it does all fail, you can replace the rollers with not too much effort...and inspect them even if it all looks good, another limiting factor to using your M3W has been resolved by the "customer development team", with extra thanks to Phil Bleazey for his innovative work on this problem.
At the moment we have some M3W's heading from the UK across Europe to Istanbul on a 4000 mile plus trip. Back in 2016 I went on my first overseas trip.....all the way to France in my 2013 M3W and felt more than a little apprehensive, with reason. I had been on several overseas trips in my other 3 wheel "kit cars" with no problems but I felt the M3W was a risk. How things have changed, mainly because of the information that has been shared on this forum. Many owners have not taken on board the advice given by some on this website but many have and now have a (fairly) reliable car that is capable of doing long trips and having a lot of fun on the way.
We were probably naive but in July 2012, we set off on the ferry to Spain with our shiny <3 month old M3W (one of the first customer ones produced) for a drive back through France ... no spares, a few spanners some gaffer tape and a Leatherman multi-tool. Despite our own personal rainstorm most of the way, we had a great time with only one stop to deal with the belt rubbing on the vestigial mud deflector & rear tyre. The bevel box was however appallingly noisy. On return, it went back for a new bevel box belt, rear tyre etc and has since had many of the improvements arising from this great forum. Now we travel with more and more spares inc Centa rollers....
Hard to know what determines roller life - when we did our (partial) Bleazey update a couple of years ago, we found the originals (fitted in ~2014 when a Centa replaced the orignal cushion drive) looked pretty well as new even with no ventilation hole at all in the bell housing. We tried the PU ones for a while but have reverted to the rubber ones with silicone grease which seem fine. Perhaps it is more than anything about driving style and type of terrain that affect the loading on the coupling...
