How Many Liters of Transmission Oil Should Be Added to the Cadillac CT6?
3 Answers
The amount of oil required for different types of engines in the Cadillac CT6 varies, as detailed below: 1. For models with the LSY 2.0T engine, the factory oil capacity is 5.7L, and the capacity when replacing the oil filter is 5.0L. The oil type used for the 2.0T engine is DEXOS1-0W20. 2. For models with the LGW 3.0T engine, the factory oil capacity is 7.67L, and the capacity when replacing the oil filter is 5.7L. The oil type used for the 3.0T engine is DEXOS1-5W30. When selecting oil, please note the following: 1. Use engine oil that meets the dexos1 specification and the correct viscosity grade. 2. Engine oil that meets the dexos1 specification and is certified by SAIC General Motors Co., Ltd. is marked with the dexos1 certification logo. 3. Using oil that meets the dexos1 specification helps protect engine performance.
Last time I helped a friend change the transmission fluid for a CT6, I carefully researched the details. This 10AT transmission has quite an appetite—it requires a full 9.8 liters. Don’t be fooled by the precise decimal; it’s actually calculated by engineers based on oil passage volume and cooling requirements. A fluid exchange machine is necessary for a complete flush, as gravity draining will leave about 2 liters in the torque converter. Always use the factory-approved Dexron VI fluid—using the wrong type can cause rough shifting. I supervised the entire process myself: the drain plug is on the side of the oil pan, and the torque wrench should be set to 25 N·m—overtightening can strip the threads.
A veteran CT6 driver with five years of experience shares some insights: Never skimp on transmission fluid—the manual specifies 9.8 liters for a reason. Last year at the 4S shop, the technician first used a diagnostic tool to check the fluid temperature and waited until it reached 60°C before draining. When replacing the filter, they found a lot of metal shavings stuck to the oil pan magnet, which is why a change every 60,000 km is recommended. They used a pressurized system to refill the fluid and finished with a road test to check shift smoothness. Spending an extra 300 yuan for the flush method, which uses two more liters than gravity drain, ensures a much more thorough replacement.
