■ Transmission oils belong to one kind of oil that keeps transmission system clean, and that enables transmission to operate in a normal way and elongates the service life of transmission actuator. Transmission oils can be further divided into automatic transmission fluid and manual transmission fluid according to different transmission structures.
■ Transmission works as one of those core components of automobile drivetrain, and entails many mechanical gears and hydraulic control devices inside that will be subjected to the high temperature, pressure, speed and other special conditions during operation. It is necessary for engineers to inject “transmission oil” into transmission so as to enhance its work performance and to ensure its secure, stable and continuous operation.
■ Transmission oil and engine lubricant are not the same product. Although both kinds of oils are featured by their lubrication effect, their benefits are different.
■ Difference: Engine lubricant serves as the lubricant for engine system and presents certain oxidation resistance, abrasion resistance, corrosion resistance and other properties, while transmission oil is mainly designed to not only keep gear system clean but also elongate the service lives of various components inside transmission. Since transmission and engine are assembled and operated in different manners, transmission oil can not be adopted as engine lubricant, and vice versa.

■ Transmission oil consists of base oil and additive. Base oil works as the main component in transmission oil and thus determines its basic properties; additives can make up for and improve the deficiencies in base oil performance, and thus endow it with new properties.

MASUMA Fully synthetic automatic transmission fluid ATF series: Apply to AT automatic transmissions.

■ Automatic transmission fluid (ATF for short) is a kind of transmission oil specifically designed for vehicles with automatic shift or automatic speed switching. Early automatic transmissions were not designed with designated fluid but adopted engine lubricant in stead. Now, the designated fluid for automatic transmission serves as not only the transmission oil for torque converter but also the lubricant for planetary gear structure and the hydraulic fluid for gearshift.

MASUMA fully synthetic continuously variable transmission oil CVTF series: Apply to continuously variable transmission (CVT).

■ Although CVTF transmission oil is similar in nature to ATF oil, it also works as a kind of designated oil. CVTF transmission oil is specially designed for steel chain drive so the flow rate, friction performance, expansion coefficient and other parameters of the required oil is different and it can not be replaced by ATF transmission oil. Relatively speaking, it is thinner than ATF automatic transmission fluid, and also presents a certain damping friction to avoid transmission chain from slipping.

MASUMA fully synthetic dual clutch transmission fluid DCTF series: Apply to dual clutch transmission (DCT).

■ Dual clutch transmission (DCT), also known as direct-shift-gear (DSG) transmission, displays very obvious advantages but its internal structure is very complex on the contrary. Although DSG also works as an automatic transmission, it is fundamentally different from previous automatic transmissions. We can regard DSG as a combination of two MTs (Namely manual transmissions) so the oil for such transmission should be a mixture between gear oil and hydraulic fluid.

MASUMA fully synthetic manual transmission fluid MTF series: Apply to manual transmission.

■ Manual transmission fluid is mainly designed to lubricate and absorb shock against transmission gears. It is applied into various gear assemblies so as to avoid the scratch, abrasion, sintering, etc., upon tooth surface. It can elongate the service life of transmission and enhance power transmission efficiency.

■ Each transmission model has been designed under different technical requirements, and even the torque, weight, rotatory rate, structure and other parameters regarding transmissions of the same model will vary as they are mounted on different vehicle models, so do transmission oils.

■ Appropriate viscosity
■ Good thermal oxidation stability
■ Good foam resistance
■ Good abrasion resistance
■ Good matching with the rubber seal material in the system
■ Good friction feature (Gear shifting performance)
■ Excellent corrosion (Rust) resistance
■ Excellent storage stability

Replacement period:

■ In general, manual transmission fluid should be replaced each two years or 60,000 km, and automatic transmission fluid needs to be replaced each 60,000 km.

Hazards from no change in transmission oil:

1. Damages to transmission shift control mechanism;
2. Abnormal abrasion in the gears and clutch discs inside transmission;
3. Impact on the normal operation of transmission and damage to its valve body.

Attentions on transmission oil replacement:

■ During the transmission oil replacement, there will be used oil residue in the oil passage and the torque converter of transmission. Therefore, when a different oil is injected into the transmission, two types of oils will be mixed with each other inside the transmission, thus may reduce the performance of transmission oil newly replaced, and result in failures in transmission, such as poor lubrication or abnormal operation state. For these reason, it is best for you to turn to a professional fully automatic transmission fluid changer for oil replacement.

■ If your vehicle is operated frequently or under complex conditions, the transmission oil should be replaced in advance. Drivers should take the transmission oil replacement into serious consideration when there is failure in gear shifting, slow response, abnormal sound from transmission as you just start you vehicle, or any other similar issue.