The 44 FF Oil Filter kit is worth fitting. I can't remember the final cost when it was retrofitted (but will look this PM) but the kit was quite cheap and it took about a day to do, mainly due to the inaccessable nature of the place it is fitted.
The problem with a 25hr change, is that some weeks you could end up doing it each week, or half way through a tour round somewhere in the summer.
The kit price from RHC is $850 US (£450).
h-r
