What are the types of manual transmission fluid?

[SanDylan]

Manual transmission fluid comes in six types: GL1, GL2, GL3, GL4, GL5, and GL6. Manual transmission fluid is commonly referred to as gear oil and its primary function is lubrication. Manual transmission fluid has a higher viscosity compared to automatic transmission fluid, and the replacement interval is generally shorter. Most household vehicles require manual transmission fluid replacement every 40,000 to 60,000 kilometers. Gear oil mainly refers to the lubricant used in transmissions and rear axles, differing from engine oil in terms of usage conditions, composition, and performance. Gear oil primarily serves to lubricate gears and bearings, prevent wear and rust, and assist in heat dissipation for the gears.

[VivienneLee]

There are quite a few types of manual transmission fluid, mainly the GL-4 specification, which suits the synchronizer structure of most manual transmission vehicles. I've driven manual cars for many years, like my old Honda, which used 75W-90 viscosity—shifting was very smooth. Never use GL-5; that stuff is designed for differentials and can corrode synchronizer rings in manual transmissions, leading to noisy shifting over time. It's recommended to change the fluid every 30,000 to 50,000 kilometers to keep the transmission internals clean. Different cars may have specific requirements—for example, Toyota or Volkswagen manuals might recommend detailed specs like 80W-90 for hot climates. When buying fluid, choose reliable brands like Mobil or Shell; don't cheap out on low-quality products to reduce wear risks and extend your car's lifespan. A friend of mine used the wrong fluid and had to spend 8,000 RMB on transmission repairs—a costly lesson. Developing a habit of regularly checking the fluid is always a smart way to save hassle and money.

[OLucia]

The commonly used specification for manual transmission fluid is GL-4, which is combined with viscosity grades such as 75W-90 or 80W-90, depending on driving conditions. Having studied cars for years, I know viscosity affects shift feel: 75W-90 provides quicker cold starts and less resistance in winter, while 80W-90 offers better high-temperature resistance. But never use GL-5 - it's not designed for manuals and can damage synchronizers. As a frequent track driver, I find lower viscosity fluids enable faster, more precise shifting. Some models like Ford or Nissan require special MT fluids from factory, so always check the owner's manual. Recommended change interval is 40,000-60,000 km to maintain lubrication and prevent gear grinding. Synthetic oils enhance performance, and a money-saving tip: buying bulk containers is more economical. Never neglect checking for leaks, as low fluid levels accelerate wear. Overall, using the correct specification keeps your car running longer and smoother.

[CharlesLynn]

Manual transmission oil is mainly classified into two types: GL-4 and GL-5. GL-4 is the most suitable model, protecting the transmission synchronizer. I started paying attention to oil types when learning to drive, and viscosity like 75W-90 has strong versatility, making shifting easier. Avoid using GL-5 as it may damage the car. The simplest method is to check the vehicle manual to find the recommended type. Change the oil regularly, approximately every 50,000 kilometers, to prevent faults. The oil change operation is not difficult and can be left to professional shops. When selecting oil, look for quality marks to avoid buying counterfeit products. Maintaining normal oil levels extends driving safety.

[LaEzra]

Manual transmission fluid must strictly be GL-4 type as it matches synchronizer design. Having serviced hundreds of manual transmissions, I've found using GL-5 often causes synchronizer ring wear and gearshift noise. Viscosity like 75W-90 is common, but specific vehicles like BMW or Chevrolet may require custom fluids like specialized full-synthetic MT oil. I always check used oil viscosity before selecting new fluid to ensure proper temperature range coverage. Recommended change interval is 40,000 km, using gravity drain tools to prevent residue. Using wrong fluid carries high risk - repairs are expensive if problems occur. Always buy certified products like API-rated fluids to extend transmission life. Monitor fluid levels regularly and top up promptly to prevent damage.

[NicoleDella]

The transmission oil model is directly related to vehicle performance and durability, with GL-4 being the optimal choice. I prioritize safe driving, using it to protect internal components from corrosion. Viscosity, such as 75W-90, affects cold starts and high-temperature lubrication; incorrect viscosity can cause gear shifting to become rough. The oil change interval should be every 30,000 to 50,000 kilometers to remove metal debris and prevent malfunctions. Choosing high-quality brands like Castrol enhances fuel economy. I've encountered cases where delayed oil changes led to increased noise and higher repair costs. Regularly checking oil quality and level ensures smooth and stable driving. Using the wrong model, such as GL-5, may cause unexpected failures; consulting an expert is recommended to avoid issues. Overall, proper oil maintenance keeps the transmission reliable for a long time.