I this video i show how to carry out a service on a transit custom gearbox showing how to replaced the transmission oil. the oil recommended for this gearbox But I'm curious as to when to change the gearbox oil, how many litres it takes and what oil is the best. Also how reliable are the Mk3 Focus ST gearboxes. MMT 6 gearbox takes 1.7 Litres of 75w-80 oil. The MMT 6 is pretty solid, it's been about for a while (was also used in the MK3 Mondeo ST220 @ 280Nm) ST250 is 260Nm. There is no recommended interval. Mazda says it's lifetime. I had a small argument with my dealer when I first bought my 2016 CX-5. They said they couldn't change the tranny fluid. I asked them then why is there a drain plug. I'm assuming Mazda's definition of lifetime is 5yrs/60,000 miles. Their powertrain warranty. The types of Automatic Transmission Fluids fall into a few categories: 1). Ford, GM and Chrysler ATF specifications: ATF Fluids are not defined by a weight as is motor oil. Rather it is defined by specification, certification or application. Ford, GM, and Chrysler have established their own specifications for automatic transmission fluids. Not the GT350 supplement guide which is what I was referring to earlier in post 1. According to this document, it states after each road course you should change your transmission oil after each event where you vehicle is subjected to individual on-track sessions exceeding 15 minutes. It states to change your oil and filter after each event. If you use your Ford Pass points it will cost just a little to upgrade to Full Synthetic, if you want your truck to run properly just follow the manual time or mileage intervals. I use Full Syn only from the dealership 5000 miles max because of carbon buildup in my Escape, I also switch between non ethanol and Costco 93 octane fuel. Transmission change intervals in cars vary from 30,000 to 50,000 miles, 100,000 to 150,000 miles, and so on. Many modern vehicles run up to over 100,000 miles before requiring a change of their transmission fluid. You should find out the interval your vehicle’s manufacturer recommends from the manual and follow the prescription religiously. Check 20000 miles/ 24 months, Change 150000 miles: Original oil: C-Max 2.0 Hybrid: Transaxle, CVT: 5,4 L: Change 150000 miles: Original oil: C-Max 2.0 Hybrid: Transaxle, CVT: 4,5 L (dry fill) Check 10000 miles/ 12 months, Change 150000 miles: Original oil: C-MAX MK I (2007-2010) Engine: Unit: Capacity: Change interval: Oil type: C-Max 1.6 16V ADkpjA.

ford c max automatic gearbox oil change interval