I've drained and refilled my BB oil this week.
I went out for a drive to get it warmed up before stripping out the seat and lower bulkhead, which seems to be the easiest way of accessing BB.
I removed all 3 plugs and some oil drained out. Not a lot, but it certainly wasn't goo. I refitted the drain plug and then filled by pumping oil in through the vent hole. Suffered the issue of oil coming out the vent hole, but none came out of the lower oil level (allen key plug) hole. After a few attempts to fill by the vent hole I tried to fill at the oil level hole. Virtually none actually went in at this hole, just seemed to pour out as fast as I was pumping it in.
I put the plugs back in and left it till the next day, when I expected the oil to have settled and would be able to pump in more. Removed the orange plug and oil level plug. Oil dripped out of the oil level hole, so I left it until it stopped and then refitted the plugs.
I reckon the BB took about 400ml oil. I've been out for a few runs and BB seems quieter then before the oil change.
The oil I used is this:
Lodexol XFS 80W/140 Fully Synthetic Limited Slip Gear Oil
Top Tip - if you don't remove the long centre tunnel aluminium strip (the one fixed on with 10 bolts) oil coming out of the vent hole is likely to run along this strip and find its way onto the floor pan. If not wiped ip properly it might get to soak into your seat base. Removing the 10 bolts is much quicker than the wiping up I had to do....
