A very interesting topic. Very helpful.
Also how do I locate the grease nipple on the drive shaft? And how often does it need greasing?
Thanks, John
On recent PLUS 4, close to the gearbox the grease nipple is hidden under the car by the wooden board. On a friend PLUS 4 we cut a hole in the wood to create an access. But be careful, there is 2 electric wires in the close area, one on each side. Begin by a small hole and enlarge it by steps.
If you don't have a lift or a jack it will be difficult.
In my PLUS 4 2005 Morgan Handbook, "These should be greased at every service" (8000 km). On my 2005 PLUS 4 there is 3 grease nipples, one on each universal joint(2), and one on the sliding part of the shaft.