I am going to do the first transmission and differentail oil change (36,000 miles) on my '01 3.0 manual z3. I decided on using Redline, but do have some questions. I have read that BMW states to use ATF fluids for manuals after '95, but that some people are using MTL for their transmissions. Has anyone using MTL run into any problems? I would think the thicker oil would better suit the manuals. I am planning on using 75 - 90w gear oil also. Is this the proper weight for street use? Last question, is it only 2 quarts of oil for both the trans and diff?....thanks.