Citroen Transaxle Gear Oil Capacity = 2.25 Liters = 4.0 UK Pint = 4.8 US Pints = 2.4 US Qts.
The fill plug is on top of the gearbox, and there's a grommet-plugged hole in the boot floor, under the carpet, for access. The oil 'level' plug is on the left side of the 'gearbox', behind the differential housing/ output shafts. The early Citroen transaxles have one hex-head plug in that area, and the later C35 version has two. The rib pattern changes on the side of the gearbox. The oil level plug is lower, in the rectangular grid area, and the other blanking plug plug is higher up in the diamond pattern area. Ignore it.
Fifth gear is in a separate housing bolted onto the back, and separated by the rear wall of the main gearbox. There's no internal passageway for oil to flow between the chambers, so it must flow through the ball bearing at the back end of the secondary shaft (lower shaft). With cold, thick oil being poured in, that can take a while. If you just pour oil in until it starts to over-flow from the level hole on the side and quit, then the oil level will end up too low after the oil finishes oozing into the 5th housing and the levels equalize.
Either fill-wait-check, fill-wait-check repeatedly until the level stabilizes. Or, with the level plug in place, just pour in the spec amount of gear oil, plus a little, walk away, and wait. Later, pull the plug from the level hole, and let any excess drain out. Or, if you wish to follow Harry's advice, just pre-measure the target amount, pour it in, and install the fill plug. Done.
Harry's advice to run with the level a little high is good. I've do it, but I don't knock myself out to ensure that it's a little high. If it's at the level hole, or a little high, I'm good with it. Just don't grossly overfil.
Just don't run the transaxle low. That's gospel.
Then if it's full or a little over is less critical.
Lotus Owners Oftha North (LOON)
Last edited by Esprit2; 02-24-2013 at 12:19 PM.