Mopar 68157291AA Fuel Filter: Complete Fitment Guide for RAM 2500–5500 Owners

If you own a RAM 2500, 3500, 4500, or 5500 with the 6.7L Cummins diesel engine, you've probably searched the Mopar 68157291AA part number and ended up more confused than when you started. Some sellers say it fits 2010–2020. Others say 2013–2018. So which is it — and does this filter actually fit your truck?

This guide gives you a straight answer with no fluff.

What Is the Mopar 68157291AA?

The Mopar 68157291AA is a genuine OEM diesel fuel water separator filter built specifically for RAM heavy-duty trucks running the 6.7L Cummins turbo diesel. Its job is simple but critical — it strips water and microscopic debris from your fuel before it ever reaches your high-pressure CP4 injection pump. Skip this filter or run a cheap aftermarket version, and you're gambling with a $6,000–$9,000 pump replacement.

This is not an aftermarket part. It is a genuine american mopar OEM component manufactured to exact factory specifications — guaranteed fitment, guaranteed seal, no surprises.

Exact Fitment: Does It Fit Your Truck?

The 68157291AA fits the following vehicles:

RAM 2500 with 6.7L Cummins — 2013 to 2018 RAM 3500 with 6.7L Cummins — 2013 to 2018 RAM 4500 with 6.7L Cummins — 2013 to 2018 RAM 5500 with 6.7L Cummins — 2013 to 2018

If your truck is a 2019 or newer, this is NOT your filter. Stellantis updated the fuel system on the 2019+ RAM lineup, and those trucks use the Mopar 68436631AA instead. Ordering the wrong one is the most common mistake RAM diesel owners make. You can find the correct filter for your year in our Mopar collection at TorqueProParts.

Why OEM Beats Aftermarket on Fuel Filters

Aftermarket fuel filters vary wildly in quality. The genuine Mopar 68157291AA uses a two-stage NanoNet filtration media that captures particles down to 3 microns. A single contaminated fill-up with a poorly filtering aftermarket part can score your injector tips and trigger failure within months.

Mopar also includes the O-ring in the box. Most budget alternatives don't — meaning you're reusing an old O-ring and risking a fuel leak at every service.

The math is simple: a genuine OEM filter costs a fraction of one injector replacement.

Replace It With the 5083285AA at the Same Time

If you're already under the hood doing a fuel filter swap, pair it with the Mopar 5083285AA oil filter. Doing both together on your 6.7L Cummins saves time, keeps your service intervals aligned, and ensures complete protection in a single job. TorqueProParts carries the full Mopar filter kit including both the 68157291AA and 5083285AA so you don't have to source them separately.

How Often Should You Replace It?

Every 15,000 miles under normal driving conditions. Replace sooner if you see a "water in fuel" warning light, notice sluggish throttle response, experience hard cold starts, or if you've been running in dusty or off-road environments. Diesel fuel quality varies massively by region — if you fill up at low-volume or rural stations regularly, err on the side of earlier replacement.

Where to Buy

Skip the dealership markup. Get genuine Mopar ram 2500 5500 parts with fast shipping and a 30-day return policy at TorqueProParts.