I drive a 1975 SIII 2.5L Petrol 4spd, and just yesterday went down to my corner parts store and picked up 4L of 85W140. After replacing gearbox and t-case fluids, I went for a drive. I realized shortly that I had made a big mistake. The stuff was so think that I could feel the engine working...

I have a 1975 Series III 88 with what I think is a IIA tranny (no syncro in 1st/2nd...double clutch). I don't know how to confirm...so maybe that is my first question. Recently, I have noticed that there is significantly great leaking occuring while the vehicle is sitting. My question is...