Would a change of very old ( possibly original ) autobox fluid make a big difference to mpg?
Im not entirely sure of the role the fluid plays in the transmission of power to the wheels.
I ask because since my cars service on weds, its become dramatically lighter on fuel.
I know by a certain mark on the fuel gauge how well its doing and usually by the time its 3 bars from the red, its got about 60 miles to go and it was on this mark when the car went into the garage. It went a full 40 miles further than usual which is a big hike on a 25 litre fill up.
The car does feel much better in that it changes gear more smoothly, kickdown is more positive and it seems to gather speed with far more ease than before. It also seems far smoother in terms of vibration under load.
Could the fresh fluid really be making all that difference?
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