Mark 1 D4-D gearbox oil filler.

[jonquirk]

Hi all,

I am preparing to replace the oil in the gearbox of my 2003 D4-D. I reckon access will be improved by removing the air cleaner box. While checking this out I spotted what looks like a filler bolt on top of the box, in addition to the level plug I could see on the side, and the as yet unseen drain plug on the bottom. I think that it may be easier to fill from the top bolt while observing the level hole for oil level reaching that point. The things is: I have seen no mention of this top plug on any guides. Can I use it to refill, or does it have some other purpose. I only have two replacement gaskets to hand so I may have to fill through the level hole anyway, but it would be nice to know

Thanks in advance for any help you can offer.

Jon.