I changed my ATF for the first time at 10K miles. It was starting to get dark, but it was nowhere near as dirty as @mavhopefull showed in his video at 30K miles.
My understanding is that the total fluid capacity of the 8F35 transmission including external lines is about 11 quarts, and I would think it might be slightly more than that for those of us that have the supplemental transmission cooler (FX4, Tremor, Lobo). If that is accurate, the drain and fill procedure only replaces about 1/3 of the fluid. Since we're only "diluting" the used fluid with fresh fluid by replacing 1/3 of it, some Ford transmission techs have suggested doing the drain & fill procedure 3 times instead of just once.
Of course use your own judgement. I think I will probably just do one drain & fill per year. I run about 10-12K miles per year on my Maverick and I've stocked up on a couple of the $25 5-quart jugs of ULV from RockAuto.
My understanding is that the total fluid capacity of the 8F35 transmission including external lines is about 11 quarts, and I would think it might be slightly more than that for those of us that have the supplemental transmission cooler (FX4, Tremor, Lobo). If that is accurate, the drain and fill procedure only replaces about 1/3 of the fluid. Since we're only "diluting" the used fluid with fresh fluid by replacing 1/3 of it, some Ford transmission techs have suggested doing the drain & fill procedure 3 times instead of just once.
Of course use your own judgement. I think I will probably just do one drain & fill per year. I run about 10-12K miles per year on my Maverick and I've stocked up on a couple of the $25 5-quart jugs of ULV from RockAuto.
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