Synchromesh 5W-30

Formulated for maximum protection in syncromesh transmissions
Designed for manual transmissions and transaxles with synchromesh systems that require light viscosity, non-extreme-pressure fortified oil. Additive technology provides proper friction characteristics for smooth shifting. The ultimate in gear and bearing protection & outperforms motor oils in manual transmissions.

AMSOIL Synthetic Manual Synchromesh Transmission Fluid is a premium-quality synthetic lubricant designed to surpass the most demanding lubrication requirements of manual transmissions and transaxles where non-extreme-pressure fluids are used.

AMSOIL Synthetic Manual Synchromesh Transmission Fluid protects gears and bearings in extreme temperatures. It outperforms conventional oils and delivers outstanding performance from -40°F to 300°F, and it maximizes energy efficiency and resists the effects of heat, oxidation, sludge and varnish deposits.

Unlike its mineral oil counterparts, AMSOIL Synthetic Manual Synchromesh Transmission Fluid prevents the thinning effects of mechanical shear for stable viscosity, superior film strength and excellent anti-wear performance. It protects against corrosion, keeps seals soft for long life, and is compatible with brass synchros for smooth synchromesh shift quality.

Ideal for Many General Motors, Chrysler, Honda and Other Vehicles

AMSOIL Synthetic Manual Synchromesh Transmission Fluid is a higher quality, lower cost replacement for multiple vehicle manufacturer-branded products. This premium synthetic formulation provides enhanced anti-wear protection and lasts longer in service. AMSOIL Synthetic Manual Synchromesh Transmission Fluid exceeds the performance requirements of both manual transmissions and transaxles.

Excellent for Service Centers

AMSOIL Synthetic Manual Synchromesh Transmission Fluid is a versatile transmission lubricant. It reduces inventory needs, is readily available and is cost-effective compared to vehicle manufacturer-branded products.

Performance Features

  • Reduces friction, heat and wear
  • Superior high-temperature stability
  • Resists heat, oxidation, acid buildup and varnish
  • Improves cold-weather shifting


Recommended for automotive and light-truck applications that require synchromesh transmission fluid. Applications include manual transmissions and transaxles such as New Venture NV T350, NV 1500, NV 2550, NV 3500, NV 3550, NV 5600, and Tremec T4, T5, T18, T56, T176, TKO500, TKO600, TR 3450 and TR 3550. Replaces MTF-94 fluid for Land Rover, MG, and Mini Cooper. Replaces Honda Genuine MTF fluid for manual transaxles and Texaco MTX fluid. Not for use in engines, hypoid rear axles, limited-slip or wet-clutch applications.

Specifications include:


  • GM 9985648
  • GM 9986105
  • GM 9985535
  • Chrysler MS-9224
  • Chrysler MS-9417

Part Numbers

  • GM 12345349
  • GM12345577
  • GM 12377916
  • GM 1052931
  • Chrysler 4874464
  • Chrysler 4874465

Service Life

Recommended for 50,000-mile service intervals or longer (up to 150,000 miles) as indicated in the owner's manual.

Amsoil Product Warranty

AMSOIL products are backed by a Limited Liability Warranty. For complete information visit

Health & Safety

This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Safety Data Sheet (SDS). An SDS is available via the Internet at or upon request at (715) 392-7101. Keep Out of Reach of Children. Recycle used oil and bottle.

Typical Technical Properties
Manual Synchromesh Transmission Fluid 5W-30
Kinematic Viscosity @ 100°C, cSt (ASTM D445) 9.7
Kinematic Viscosity @ 40°C, cSt (ASTM D445) 48.3
Viscosity Index (ASTM D2270) 190
Flash Point °C (°F) (ASTM D92) 218(424)
Pour Point °C (°F) (ASTM D97) -46(-51)
Four-Ball Wear Test Para 1 (75°C, 1200 rpm, 40kg, 1hr.) Scar, mm (ASTM D4172) 0.40
Brookfield Viscosity @ -40°C, cP (ASTM D2983) 39,050
Foam Stability (ASTM D892) (20/50/20) Max 0/0,0/0,0/0
Copper Corrosion 3 hr, 121°C (ASTM D130) 1A
Amsoil Pricing Information

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