My automatic will shift to 4th gear by 25 MPH if I drive light footed like I have been doing the last week. It got me the best MPG's I've ever gotten since buying the car by driving this way (29.3 MPG). Would a fluid change help me out here or is there a more serious problem lurking here? The bowden cable is adusted correctly.

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DJ


84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012