CarCareTruth Score
Decent, but it's tough on the environment.
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Prices may varyThis product ranks #8 of 15 in Transmission Fluid.Three above it ↓
Last reviewed July 13, 2026
TL;DR Honda Genuine Manual Transmission Fluid (08798-9031) is Honda's factory-fill gear fluid for its manual gearboxes, from older Civic manuals through the current Civic Si and Type R 6-speeds. It carries a WARNING signal word for eye irritation (H319) and no Proposition 65 warning. Independent, long-term shift-quality evidence specific to this exact fluid is limited.
Made by Idemitsu under Honda's contract, this fluid is formulated for the synchro and gear metallurgy in Honda's manual gearboxes, including the Civic Si (L15CA) and Type R (K20C1) 6-speeds. Honda's typical interval is 30,000 miles for older chassis, longer on current models; no independent oil-analysis data confirms this. Manufacturer copy describes improved shift quality over a prior formula, though community tracking is limited.
Owners of a Honda or Acura manual transmission whose owner's manual specifies this fluid, including Civic Si and Type R owners doing a factory-spec change. Automatic or CVT-equipped Honda owners should use ATF DW-1 or their CVT fluid instead; non-Honda owners should use their maker's spec.
The SDS carries a WARNING signal word from H319 (eye irritation); Section 8 calls for splash goggles when pour-splash is possible, and gloves are reasonable given the petroleum base and zinc antiwear additive. No Proposition 65 warning applies. The additive is harmful to aquatic life, so take spent fluid to a used-oil facility, not a drain.
No. MTF (part 08798-9031) is a manual-transmission gear fluid engineered for synchro and gear metallurgy in Honda's manual gearboxes. ATF DW-1 is a separate automatic transmission fluid for Honda's automatic and CVT-adjacent applications. They are not interchangeable.
Honda manual-transmission models across several generations, including Civic manual chassis and the current 11th-generation Civic Si and Civic Type R (both 6-speed manual), plus Acura manual models that share the same part number, including the RSX Type-S and TSX 6-speed. Owners should confirm their specific model and transmission call for MTF in the owner's manual before purchasing, since some Honda and Acura manuals use a different specified fluid.
Honda's typical interval is around 30,000 miles for most manual-transmission models; some current models specify a longer interval. Check your vehicle's maintenance schedule rather than relying on a single number, since the interval varies by chassis.
Some owners use aftermarket gear oils marketed as compatible, and community reports on these vary. Honda engineered this fluid's chemistry and friction-modifier package specifically for its own synchro material; using a fluid not designed for that hardware carries the same category of risk that applies to any fluid substitution CarCareTruth generally flags: notchy or crunchy shifting and accelerated synchro wear if the chemistry is a poor match.
No. The manufacturer's Safety Data Sheet states the product does not contain any Proposition 65 listed chemicals, and none of its disclosed ingredients appear on California's Proposition 65 chemical list.
Marketing copy from Honda, via Amazon. Not editorial.
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