Fuchs Titan ATF 4135 Review
I used this in my older Mercedes Kompressor Auto and wow what a difference it has made to shift quality both when warm, and most noticeably from cold. The gearbox was always relatively smooth and now it glides through the gears like butter, even under heavy acceleration.
I can't comment on other cars but I found with the C Class that you either have to strain all the oil out using a powered pump through the refill hole to extract under suction, or refill just the 4-4.5 litres you can drain from the sump and then refill and repeat the change a few weeks later to ensure mostly new oil is present.
On the C Class unless you do either of the above two methods you will be left with circa 3 litres of old oil still sloshing round the gearbox / torque converter. You can but a small vacuum pump off ebay for around £20 that you run off your car battery.
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