I have a Euro W126 with manual transmission (4 speed). I do not have the original manuals, but have a Haynes. It suggests using motor oil for the transmission. It also calls for like 2 qts (do not have it in front of me now, going by memory). This does not seem right. I want to use synthetic and was going to order some Red Line MTF that is all the rage on the Miata Forum. It of course would be much easier to go to auto zone and pick up some Mobil 1. Any suggestions about weights and volume? Thanks in advance.

__________________
Currently
1991 Mazda Miata 174000
1991 Subaru 189,000 Winter beater

got rid of:
1984 VW Vanagon 195,000
1976 350SE Euro 185,000 KM
1973 280SE 4.5 (boy do I regret that)
1980 280SE European W126 4 speed manual (miss it)
1989 BMW 735iL 119000 (good riddance)