Castrol Transmax DEX/MERC Automatic Transmission Fluid
1 Gallon
Price as of 2026-06-21. Check Amazon for the current price.
Quick Decision
Price Intelligence
- Budget:$6–$23
- Mid-range:$23–$75← You are here
- Premium:$75+
Is This Right For You?
- •Those who want a top-rated option — in the top 14% of transmission fluids by rating
- •Castrol loyalists — the brand spans 62 products in our database
- •Lucas Oil Transmission Fix — 58% cheaper at $14 (Score A+)
- •Ford MERCON LV Automatic Transmission Fluid — higher rated at 4.9/5 ($54)
📊 Based on data analysis of 191 products in this category.
Mubboo Score: A
How we calculate the Mubboo Score
Quality (45%): customer rating, normalized to a 10-point scale
Popularity (35%): review volume vs the category leader, log-scaled
Value (20%): price position vs other transmission fluids
Computed from live Amazon rating, review count, and price across 191 transmission fluids available to US consumers · last refreshed 2026-06-21.
How It Compares
This Product Castrol Transmax DEX/MERC Automatic Transmission Fluid | Most Popular Lucas Oil Transmission Fix | Best Rated Ford MERCON LV Automatic Transmission Fluid | Best Value ACDelco GM Original Equipment 10-9394 | |
|---|---|---|---|---|
| Price | $32.88 | $13.97 | $53.50 | $13.99 |
| Rating | 4.8/5 | 4.7/5 | 4.9/5 | 4.8/5 |
| Reviews | 2,242 | 8,265 | 2,629 | 1,195 |
| Mubboo Score | A | A+ | A- | A |
About Castrol
- 62 products in our database
- Average rating: 4.8/5 across all products
- Price range: $12.99 – $187.25
- Categories: brake-fluids, Fuel Additives, Motor Oil, transmission-fluids
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Bottom Line
Castrol Transmax DEX/MERC Automatic Transmission Fluid earns Mubboo Score A. Priced at $33 — a mid-range option, below the category average of $59. Rated 4.8/5 from 2,242+ reviews. Strong buy if: those who want a top-rated option, castrol loyalists.
Frequently Asked Questions
Is the Castrol Transmax DEX/MERC Automatic Transmission Fluid worth buying in 2026?
It earns a Mubboo Score of A, with a 4.8/5 rating from 2,242 reviews — better than 86% of transmission fluids we track.
How much does the Castrol Transmax DEX/MERC Automatic Transmission Fluid cost?
It is currently $32.88 — mid-tier pricing for transmission fluids.
How does the Transmax DEX/MERC Automatic Transmission Fluid compare to other transmission fluids?
The category's most-reviewed alternative is the Lucas Oil Transmission Fix (4.7/5, 8,265 reviews, $13.97). The Transmax DEX/MERC Automatic Transmission Fluid carries a Mubboo Score of A vs A+.
Sources & References
Products available through US retailers. Prices in USD. Sales tax varies by state and is not included.
Mubboo may earn a commission on purchases made through affiliate links. This does not affect our Mubboo Score, product rankings, or editorial judgments. Prices are accurate as of the last sync (2026-06-21) and may change.