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2018 Charger R/T - Transmission Fluid Change Interval & Type?

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Mike T. · rep 0 · May 25, 4:18 AM · 1 replies · solved · Question

Vehicle: 2018 Dodge Charger R/T

Hey everyone, I've got a 2018 Dodge Charger R/T with the 5.7L Hemi, currently sitting at about 75,000 miles. I've been pretty diligent with my oil changes and other basic maintenance, but I'm starting to wonder about the transmission fluid.

The owner's manual mentions different intervals for 'severe duty' driving, and I do a significant amount of city driving with a lot of stop-and-go traffic. I'm trying to figure out if I should be looking at a full transmission flush or just a drain and fill.

What's the recommended interval for my car with this kind of driving? Also, what type of fluid is best for the 8-speed automatic transmission in these Chargers? I want to make sure I keep it running strong for years to come.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:18 AM

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ClearTheCode admin answer:

Maintaining your transmission fluid is crucial for the longevity of your 2018 Dodge Charger R/T's 8HP70 8-speed automatic transmission. Here's what you need to know:

  1. Recommended Intervals: For normal driving conditions, Chrysler typically recommends inspecting the transmission fluid at 60,000 miles and changing it at 120,000 miles. However, given your 'severe duty' city driving with stop-and-go traffic, it's highly advisable to shorten this interval. Many enthusiasts and mechanics recommend a fluid and filter change between 60,000 to 80,000 miles for vehicles under severe conditions.

  2. Fluid Type: Your ZF 8HP transmission requires specific fluid. You must use Mopar ZF 8&9 Speed Automatic Transmission Fluid (part number 68157995AB or equivalent) or a compatible fluid that meets ZF's LifeguardFluid 8 specification. Using the wrong fluid can lead to premature transmission wear and failure.

  3. Drain and Fill vs. Flush:

    • Drain and Fill: This method replaces only a portion of the old fluid (typically 4-6 quarts out of 9-10 total). It's generally safer for higher mileage transmissions that haven't been serviced regularly, as it avoids disturbing accumulated debris. You might need to do multiple drain and fills over time to replace most of the fluid.
    • Flush: A full transmission flush uses a machine to push all the old fluid out and replace it with new fluid. While more comprehensive, it can sometimes dislodge debris in older, unserviced transmissions, potentially causing issues. For a regularly maintained transmission within recommended intervals, a flush can be beneficial. Given your mileage and driving, a drain and fill might be a safer first step, or consult a specialist for a flush if they can perform it gently.

  4. Filter Replacement: Always replace the transmission filter when changing the fluid. The pan gasket should also be replaced.

When to See a Shop: If you're unsure about performing this DIY, or if your transmission is exhibiting any unusual symptoms (slipping, hard shifts, delayed engagement), it's best to take it to a qualified mechanic or a dealership. They have the specialized tools and knowledge to perform the service correctly and diagnose any underlying issues.

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