I have no experience with them on Defenders etc, but I have used them on Series Landrovers, and find that the sealed ones last a lot longer unless the seal is damaged. This may be a function of quality rather than whether or not there is a grease nipple, but I suspect the seals on the greaseable ones are nowhere near as good at keeping dirt and water out
The sealed ones on my 110's tierod have done around 250,000km - were replaced when a heavy duty tierod was fitted. The one on the steering box end of the draglink has been replaced once, and a second time when a new box was fitted. I am pretty certain the one on the other end of the drag link is original at 490,000km.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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