How to Determine Which Transmission Fluid to Use

Each vehicle requires a specific transmission fluid type. A transmission uses hydraulic lubricants with a fixed tolerance for temperatures. Every transmission, whether automatic or manual, relies on transmission fluid. When the level of transmission fluid is too low, the transmission stops working and the car will not move. Transmissions requiring fluids with different viscosity ratings have spawned numerous transmission fluid product choices, which are not interchangeable. Contemporary vehicles have several varieties of transmissions, and some use synthetic transmission fluids. Only the type specified by the manufacturer can be used without risking damage to your transmission.

Difficulty: Moderately Easy

Instructions

Things You'll Need:

• Internet access

1. Consult an expert regarding suitable replacements for transmission fluids that are no longer produced. Transmission fluid types for some classic cars are simply not available. An automotive expert addresses such a situation on the interactive website forum at allexperts.com (see Resources).

2. Check the owner's manual for transmission fluid types approved by the manufacturer. If you don't have the owner's manual, see whether it's available online. Consulting the online owner's manual for some vehicles is free, though a few auto makers charge a fee. Online vehicle owner's manuals are listed at Edmunds.com (see Resources).

3. Ask an auto parts dealer for help. Parts store clerks have access to databases with manufacturer specifications for parts and chemical fluids used in almost all vehicle models.

Tips & Warnings

• A vehicle transmission should be serviced by changing the fluid and filter occasionally. Consult the owner's manual or ask a knowledgeable mechanic for information on transmission service intervals.
• Never use a substitute transmission fluid type. Costly transmission damages can result from using the wrong fluid.

Resources

• AllExperts.com on antiquated transmission fluid
• Edmunds.com list of online vehicle owner's manuals

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