![]() ![]() There were no oil stains on the oil sump or the exhaust crossover pipe, indicating that the coating did not come from the front of the vehicle and was not engine oil. The transmission housing was coated with an oily fluid. ![]() Confirmation of the transmission overflow was gained by viewing the underside of the vehicle. The damage indicated that the origin of the fire was transmission fluid that overflowed the dipstick tube and was ignited by the catalytic converter in the exhaust system directly below the dipstick tube. The fire damage was most intense at the level of the transmission dipstick and faded as it went forward and up the engine block. Our expert examined the vehicle and its burn patterns. He also reported that the trailer was not loaded to full capacity and that he was not exceeding the speed limit at the time of the fire. The owner also reported that the vehicle did not have a history of oil leaks of any kind, that he kept the vehicle serviced on a regular basis and that the transmission had been recently serviced (including filter and fluid replacement). When he stopped the vehicle and looked under the right front fender he saw the roadside grass on fire. The owner/driver, reported that he saw a light-colored smoke in his rear view mirror and started to pull off the road to the right-hand shoulder. Our expert was assigned to inspect a pickup truck that suffered an engine fire while pulling a trailer. On my way home last night, I stopped and put a quart of IBC Root Beer in my brother's transmission. So in the interests of science, I'm conducting a little experiment as we speak. We've never actually seen any evidence of this occurring. And if it's foamy, the fluid won't be able to adequately lubricate the transmission, and it gets damaged. Tom: I suppose what can happen is that the oil can foam and "froth," kind of like a root beer float. Ray: But I have to admit, I've never personally seen a case where overfilling has caused any damage to an automatic transmission. Overfilling May Lead to You Making Your Mechanic's Boat Payment This Month." You may notice a little warning that says something like "Caution: Do Not Overfill. Does it harm an automatic transmission if the fluid is well above the "full" mark on the dipstick? Lynn ![]()
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