Hi, Guest
03-28-2006, 09:12 AM
(This post was last modified: 03-28-2006, 09:52 AM by OAC_Sparky.)
There is no extra wear and tear leaving the car in OD all the time while you drive. As for mileage, you get better mileage with the OD on.
The only reason to turn off OD in most Fords (at least) would be to:
(1) Keep the transmission from "hunting" under load when towing or in very hilly terrain. For example, when I was in Colorado I rented a Contour that had an Auto trans and a 4cyl, was underpowered for mountain driving. While climbing, the engine didn't have the power to hold the highway speed, in OD, it kept downshifting, then speed up, shift up to OD, slow down and so on. This was very dangerous because the roads were icy, and it was kinda scary when it kept shifting around. Turning off the OD will keep this from happening.
(2) Coasting downhill, you can turn off the OD to keep the car speed down without overusing your brakes.
The only reason to turn off OD in most Fords (at least) would be to:
(1) Keep the transmission from "hunting" under load when towing or in very hilly terrain. For example, when I was in Colorado I rented a Contour that had an Auto trans and a 4cyl, was underpowered for mountain driving. While climbing, the engine didn't have the power to hold the highway speed, in OD, it kept downshifting, then speed up, shift up to OD, slow down and so on. This was very dangerous because the roads were icy, and it was kinda scary when it kept shifting around. Turning off the OD will keep this from happening.
(2) Coasting downhill, you can turn off the OD to keep the car speed down without overusing your brakes.
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