Castrol Transmax DEX/MERC Automatic Transmission Fluid, 1 Gallon
Castrol Transmax DEX/MERC Automatic Transmission Fluid, 1 Gallon
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Castrol Transmax DEX/MERC Automatic Transmission Fluid, 1 Gallon

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Key item features

  • Smooth Performance: Enhanced friction durability for smooth transmission performance.
  • DEXRON-IIIH Compliant: Meets DEXRON-IIIH requirements and also satisfies DEXRON, DEXRON-III, IIE, and II standards.
  • MERCON Compatibility: Meets MERCON requirements and can be used in power steering applications where MERCON is required.
  • Vehicle Suitability: Designed for use in older GM and Ford vehicles.
  • Warranty Compliance: Exceeds all passenger car and light truck manufacturers' warranty requirements for vehicles, transmissions, or power steering service where a DEXRON-IIIH or MERCON type ATF is specified.
  • Application Restrictions: Not suitable for applications calling for DEXRON-VI, MERCON V, or MERCON SP.
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Current price is $32.8825.7 ¢/oz
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Customer ratings & reviews

4.6 out of 5 stars
stars55 ratings30 reviews
How item rating is calculated
  1. 5 stars78% (43)
  2. 4 stars9% (5)
  3. 3 stars9% (5)
  4. 2 stars0% (0)
  5. 1 star4% (2)

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  • : Maintains color vibrancy over time.
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Showing 1-3 of 30 reviews

Jul 27, 2025
Joint
5 out of 5 stars review

Verified Purchase

Transmission for the old

I haven't used it yet but I always use castrol and never been sorry it says for older gm transmissions because they've done away with the original trans fluid so hope it works well

Incentivized Review
Helpful?2Z27N3E9ORSG17253576
Sep 16, 2016
59fiat
5 out of 5 stars review

Verified Purchase

A great ATF

Price is right and the oil has proved itself in my 90 Volvo 740. I drive it hard and have flushed it before with this ATF. I am about to change it after many years of use. Oil still smells good and the transmission shifts fine but there is evidence of darkening on the dip stick (probably clutch friction material). Preventive maintenance is the key to avoiding expensive automatic transmission repairs. So I use 12 quarts to flush through the trans to expel all the old fluid. Expensive to use that much but not as expensive as repairing the trans. Machine flushing in a garage uses 15 to 16 quarts! I am a retired mechanic.

Helpful?2Z27N3E9ORSG17253576
May 20, 2026
shopper
Top Reviewer
5 out of 5 stars review

Verified Purchase

A good price for a reliable item!

The reason our cars have tons of miles on them and still run well is that we only use quality products like this in them.

Helpful?2Z27N3E9ORSG17253576