The leakage was on the inlet of return hose connection side to the Magefine Filter. This happened to me during the summer, after about 2 weeks of 100 def F temperatures after 9 months of being on the vehicle ie 12000km.
The auto trans expert I laised with uses Raybestos, an inline trans filter with a metal casing, but no magnet. If I was to use inline filters again, I would place an extra magnet or two in the plan and use an inline filter with a metal casing. It helps to transfer heat from the fluid as well.
When I cut open the magnefine filter I found very little residue on the magnet. Looking at it's construction on the inside, the fluid hits magnet and then is forced to split direction and flow around and out through the other end.
As a result I am not convinced that the magnet in an inline filter will do much more as the paper filter will remove most of the ultra fine microscopic particles any way, using extra OEM magnets in the pan would pickup the rest.
Perhaps I got a bad batch, but as one was replaced after 9 months under warranty, the replacement one didn't last much longer. The Holden Dealer convinced me that any extra cuts in the line is an extra point for leakage and suggested the cooler + additional pan magnets, with an oversized pan yielding 1 litre extra capacity.
I hope this helps, more than one way to skin a cat.
I recommend that you locate the filter on the return line in a place where it has access to good air flow. to keep it cool, just to help further minimise the potential risk of leakage.
