You don't have any codes, there's nothing tripping the customer to check it out, there's no big red light that says something is wrong. "It's kind of weird, it feels like it's slipping, you're not really sure what's going on with it. "So you've reached a critical point in the transmission where all of a sudden you start feeling maybe it doesn't shift like it used to," says Wiggins. And at that time there isn't anything the radiator or cooler can do for it. When that slipping happens, that's when the transmission fluid really starts to get hot. Once that happens, the friction clutch plates inside the transmission fail to hold their friction, and they start slipping. It will become black or dark, dark, cherry red, and that's when the fluid viscosity starts breaking down. Eventually that fluid will become tarnished. "That's basically what happens to your transmission fluid. Wiggins uses the analogy of burning grease on a frying pan. Let's look at a possible scenario where the transmission fluid has never been changed. And that's due to heat, and that's what basically breaks down transmission fluid and causes transmissions to fail." "So, somebody that has 30,000 miles on a vehicle in a couple of years due to highway mileage in comparison to someone that has 30,000 city miles in three or four years the city-mileage transmission fluid will actually be more deteriorated than the highway-mileage fluid. "City mileage tends to warm the transmission up much more frequently over the long haul than it does on the freeway," Wiggins says. Transmissions are designed to operate at high temperatures, but consistent overheating can break down the fluid. It will allow your vehicle to last longer, especially if you're driving in the city in comparison to driving highway mileage." The reality is, though, all transmission fluid should be changed. "This transmission fluid will be good until the transmission decides it's going to fail, which isn't until 140,000 to 160,000 miles, so the consumer felt comfortable with that statement. ATRA has accredited members in transmission repair shops across Canada.
"Manufacturers started going to what they called 'fill-for-life.' To the consumer that meant you didn't have to take your transmission in every 30,000 miles like you did back in the '90s." says Lance Wiggins, technical director at the California headquarters of the Automatic Transmission Rebuilders Association (ATRA). Look online if you can't locate the hard copy, or call the dealer or manufacturer.
#Changed transmission fluid now shifts hard manual#
Your vehicle's service manual contains recommended maintenance intervals. How often fluid should be replaced depends on the type of driving you do.
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