What is Transmission Oil?

2 Answers
Thompson
07/28/25 8:07pm
Transmission oil, also known as gearbox oil, is the lubricant used in the transmission system. Below are the functions of transmission oil: 1. It keeps the gear shifting system clean and serves to lubricate and prolong the lifespan of the transmission components; 2. It provides effective lubrication even in low-temperature conditions and reduces oil loss under harsh operating conditions. Transmission oil replacement intervals: Generally, automatic transmission oil should be replaced every 2 years or 40,000 kilometers, while manual transmission oil has more restrictions and is typically replaced every 30,000 kilometers. When replacing, it is advisable to use the original manufacturer's specialized oil, as different vehicle models have different transmissions and thus require different types of transmission oil.
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VanRachel
08/12/25 12:56am
After years in the automotive world, I've come to value transmission fluid highly. Essentially a specialized lubricant for gearboxes, it's like the lifeblood that keeps all those gears and bearings working smoothly – just as blood circulation sustains the human body. Manual and automatic transmissions require different fluids, with automatic transmission fluid being more sophisticated as it also handles hydraulic power transfer. This fluid isn't just about lubrication; it plays crucial roles in cooling and cleaning too. During every maintenance check, I personally inspect the dipstick: fresh fluid shows a translucent claret color, but after 50,000-60,000 km it turns soy-sauce dark – that's when replacement is due. Seasoned drivers all know better than to believe those 'lifetime fluid' claims – delaying changes could lead to transmission overhauls costing ten times more than fluid replacement. I still remember my friend's car jerking like a bucking horse during highway gear shifts, all caused by deteriorated fluid making clutch plates slip. That's why I now change it religiously every 40,000 km – I'm even more meticulous about this than brake pad replacements.
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