Red Line 30504 D4 Automatic Transmission Fluid vs Castrol Transmax ATF High Mileage Transmission Fluid

The Red Line 30504 D4 Automatic Transmission Fluid is a relatively good Transmission Fluid for people that are willing to spend around $12. The Castrol Transmax ATF High Mileage Transmission Fluid, by contrast, is quite unremarkable and doesn't stand out in any meaningful way from other products at this price point.

In both cases, however, we recommend that you take look at some other options at the $12 and $25 budget ranges; in all likelihood you'll find some better alternatives.

If you're still interested in learning more about the Red Line 30504 D4 Automatic Transmission Fluid and Castrol Transmax ATF High Mileage Transmission Fluid, however, we wrote a summary of what we know about them:

The Red Line 30504 D4 Automatic Transmission Fluid hasn't managed to perform well enough to earn a place in any Transmission Fluid roundups conducted by sources that do their own, high-quality, hands-on testing. That alone makes it a hard product to recommend.

Taking a look at the Castrol Transmax ATF High Mileage Transmission Fluid, we found that it hasn't managed to perform well enough to earn a spot in any Transmission Fluid roundups done by sources that conduct their own, high-quality, hands-on testing. That alone makes it difficult to recommend.

As a last step, we wanted to do a head-to-head Red Line 30504 D4 Automatic Transmission Fluid vs. Castrol Transmax ATF High Mileage Transmission Fluid comparison of their review performance but, unfortunately, weren't able to find any review ratings on either product.