Red Line 30504 D4 Synthetic Automatic Transmission Fluid
(ATF) - 1 Quart (4 Pack)
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 3% of transmission fluids by rating
- •Red Line loyalists — the brand spans 25 products in our database
- •Castrol Transmax High Mileage Automatic Transmission Fluid — 56% cheaper at $28 (Score A)
📊 Based on data analysis of 191 products in this category.
Mubboo Score: B+
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 Red Line 30504 D4 Synthetic Automatic Transmission Fluid | Most Popular Valvoline Multi-Vehicle | Best Rated Ford MERCON LV Automatic Transmission Fluid | Best Value Castrol Transmax High Mileage Automatic Transmission Fluid | |
|---|---|---|---|---|
| Price | $62.98 | $93.46 | $53.50 | $27.99 |
| Rating | 4.9/5 | 4.8/5 | 4.9/5 | 4.8/5 |
| Reviews | 1,326 | 11,186 | 2,629 | 1,904 |
| Mubboo Score | B+ | A- | A- | A |
About Red Line
- 25 products in our database
- Average rating: 4.8/5 across all products
- Price range: $12.79 – $519.96
- Categories: brake-fluids, Fuel Additives, Motor Oil, transmission-fluids
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Bottom Line
Red Line 30504 D4 Synthetic Automatic Transmission Fluid earns Mubboo Score B+. Priced at $63 — a mid-range option, above the category average of $59. Rated 4.9/5 from 1,326+ reviews. Strong buy if: those who want a top-rated option, red line loyalists.
Frequently Asked Questions
Is the Red Line 30504 D4 Synthetic Automatic Transmission Fluid worth buying in 2026?
It earns a Mubboo Score of B+, with a 4.9/5 rating from 1,326 reviews — better than 97% of transmission fluids we track.
How much does the Red Line 30504 D4 Synthetic Automatic Transmission Fluid cost?
It is currently $62.98 — mid-tier pricing for transmission fluids.
How does the 30504 D4 Synthetic Automatic Transmission Fluid compare to other transmission fluids?
The category's most-reviewed alternative is the Valvoline Multi-Vehicle (4.8/5, 11,186 reviews, $93.46). The 30504 D4 Synthetic Automatic Transmission Fluid carries a Mubboo Score of B+ 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.