Mopar Coolant: Verify MS-90032 by VIN or Visit a Dealer
Mopar’s current coolant standard is organic additive technology (OAT) conforming to MS-90032, used in Chrysler, Dodge, Jeep, and Ram vehicles from the 2013 model year forward with a 10 year or 150,000 mile service life. It ships as concentrate or 50/50 premix under part numbers including 68163848AC and 68163849AC, and it’s typically purple. Never mix it with older orange HOAT or green IAT coolant; if mixing happened, the system needs a professional flush.
TL;DR:
The 10 year or 150,000 mile service interval assumes uncontaminated OAT mixed with high purity water; contamination or another chemistry shortens it.
Confirm coolant by the reservoir label or VIN, since color is only a clue and aftermarket dyes or aging can make it misleading.
An alternative qualifies only when its technical or safety sheet lists MS-90032 or MS-12106 and identifies OAT; universal labeling alone proves nothing.
For concentrate, use distilled or deionized water at a 50/50 ratio; reserve up to 70/30 for extreme cold and follow the owner’s manual.
If coolant looks cloudy, contains sediment, smells like ammonia, or may have mixed, stop topping off and arrange a professional flush.
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Table of Contents
When an authorized dealer should handle your coolant service
Primary sources: Mopar owner manuals, service bulletin, and MS-90032 guidance
What MS-90032 Mopar OAT coolant is
OAT stands for organic additive technology. Instead of the silicate and phosphate inhibitors found in older antifreeze formulas, OAT coolant relies on organic acid salts to protect aluminum, cast iron, and the rubber and plastic components inside a modern cooling system. Chrysler switched to this chemistry for the 2013 model year, and the change is documented in Service Bulletin 07-004-12, which announced the new OAT coolant and the material standard it had to meet.
That standard is MS-90032. It’s the specification Mopar engineers wrote to define exactly what additives, concentrations, and performance thresholds a coolant must hit to protect a Chrysler, Dodge, Jeep, or Ram engine for the long haul. The owner’s manual for the Ram 2500/3500 names it directly: Mopar recommends its 10 Year/150,000 Mile OAT coolant, conforming to MS-90032, for vehicles built from 2013 onward.
Genuine Mopar OAT coolant comes in a few OEM forms, and recognizing them helps when you’re shopping or checking what’s already in your radiator:
Concentrate: mixed with water before use, sold under part numbers such as 68163848AC.
50/50 premix: ready to pour, sold under numbers such as 68163849AC.
Revision letters (AA, AB, AC): reflect labeling or minor updates rather than a change in chemistry.
The 10 year/150,000 mile interval assumes the system stays filled with the same OAT chemistry from day one, mixed with high-purity water, and never contaminated with a different coolant type. Break any of those conditions and the interval shortens, regardless of what the sticker under the hood says.
How to identify the coolant in your vehicle
Before you top off or buy a jug of antifreeze, confirm what’s actually in your cooling system. A few minutes of checking saves a much bigger headache later.
Check the coolant reservoir and radiator cap for a label listing the coolant type, part number, or MS-90032 reference. Many Mopar vehicles stamp this information directly near the fill point.
Look up your VIN through a dealer parts department or the Mopar parts store to confirm the exact coolant specified for your model year, since part numbers can shift across production years.
Note the color, but don’t rely on it alone. Mopar’s OAT coolant is typically purple, while older HOAT coolant often runs orange and traditional IAT coolant is usually green. Color is a clue, not proof. Aftermarket products use inconsistent dye colors, and a faded or aged coolant can shift shade.
Inspect for contamination. Cloudy coolant, rust-colored sediment, a gelatin-like texture, or a sharp ammonia smell all point to mixed chemistries or degraded inhibitors.
Schedule a professional flush if you see any of those signs, or if you’re not sure what’s currently in the system. Guessing and topping off blindly is how two incompatible coolants end up mixed.
Why you can’t mix coolant technologies
Mixing OAT with HOAT or IAT isn’t a minor compatibility issue. These chemistries use different inhibitor packages, and combining them causes the additives to drop out of solution. The result is a gelatinous sludge that clogs narrow passages in the radiator, heater core, and water pump, reducing flow right when the engine needs it most.
Service Bulletin 07-004-12 warns that mixing coolant technologies can cause corrosion, debris, and an ammonia-like smell, and it calls for a flush when this happens. These aren’t cosmetic problems. Corrosion protection breaks down unevenly across metal and rubber components, and the sludge itself can accelerate wear on seals and gaskets.
Watch for these warning signs if you suspect mixed coolant:
Ammonia or sour odor near the reservoir or radiator.
Visible debris or a cloudy, gel-like texture instead of clear fluid.
Overheating or inconsistent temperature readings, which can signal reduced flow from clogged passages.
Mixing OAT with HOAT or IAT can trigger inhibitor dropout and sludge formation, and Mopar’s own service bulletin calls for an immediate professional flush when this occurs. That flush clears the contaminated mixture and restores a single, compatible chemistry before corrosion sets in.
The safest approach is to stop guessing by jug color and start checking the specification. A bottle labeled orange or purple doesn’t tell you what’s inside; the technical data sheet or safety data sheet does.
Choosing an acceptable alternative without guesswork
Genuine Mopar coolant isn’t the only product that meets MS-90032, but confirming equivalence takes more than reading the jug. The dominant marketing word on store shelves is “universal,” and that word alone tells you nothing about chemistry.
Look for an explicit MS-90032 reference on the product’s technical data sheet or safety data sheet, since that’s the standard Mopar engineers actually wrote the coolant against.
MS-12106 is a pre-diluted equivalent of the same OAT chemistry, so a product citing either standard is working from the same formulation family.
Confirm the chemistry is OAT, sometimes labeled carboxylate, rather than HOAT or a hybrid silicate blend.
Skip products that only say “universal” or “all makes” without citing a specific material standard. That label is a marketing shortcut, not a spec.
When you’re unsure, buy OEM Mopar coolant by VIN through a dealer parts department rather than guessing on a store shelf.
Pro Tip: Keep a photo of your reservoir label or part number on your phone; it makes matching the correct spec at a parts counter or online store much faster.
Mixing, topping off, and knowing when to call the dealer
Concentrate needs the right water to perform as designed. Mopar’s guidance is to mix with distilled or deionized water, never tap water, since minerals in tap water can interfere with the corrosion inhibitors and shorten the coolant’s service life.
Mix 50/50 concentrate to water for standard use across nearly all climates and driving conditions, following recommended car shampoo dilution ratios for proper mixing.
Increase concentrate up to a 70/30 ratio only in extreme cold climates, following the mixing guidance in your owner’s manual.
Always use distilled or deionized water, since the owner’s manual specifically cautions that lower-quality water reduces corrosion protection.
Top off only with a cold engine, and remove the cap slowly to release pressure safely before adding fluid.
Add small amounts and recheck the level, since overfilling can push fluid out through the overflow once the engine warms up.
Topping off between services is a job most owners can handle safely at home. A full drain, flush, and refill is a different task, and it’s where dealer service earns its keep. Schedule a dealer visit when you notice sediment or cloudiness, when you suspect two coolant technologies have mixed, or when your vehicle uses a special-fill cooling system that requires bleeding air from specific points to avoid trapped pockets. Our coolant flush cost guide breaks down what a DIY flush versus a shop visit typically runs, which helps when you’re deciding which route fits your situation.
Pro Tip: Write the date and mileage on a sticker near the reservoir every time coolant is serviced; it keeps you from losing track of the 10 year/150,000 mile window.
When an authorized dealer should handle your coolant service
Some coolant jobs are simple enough for a driveway. Others call for the right tools and parts knowledge, and that’s where authorized dealer service makes the difference. If your coolant shows sediment, an ammonia smell, or signs that two chemistries were mixed, a dealer can perform a full drain, flush, and refill using equipment designed to clear the system completely rather than just topping it off.
VIN-based parts lookup confirms the exact coolant specification and part number for your specific vehicle.
Genuine Mopar fluid keeps the chemistry consistent with what the engine was engineered around.
Proper flush and refill procedures clear sediment and air pockets that a basic top-off can’t reach.
A documented service record supports warranty claims and resale value down the road.
You can book a service appointment or check genuine Mopar parts and accessories through our parts department when you’re ready for VIN-verified coolant or professional flush service.
A straight answer for Mopar owners weighing their options
The conservative move here is also the simplest one: stick with MS-90032 OAT coolant for the life of your vehicle, and don’t improvise with whatever jug is cheapest at the auto parts store. When you’re uncertain what’s in your system, a VIN-based parts lookup and a quick call to a dealer service department settle the question faster than guessing by color. That small bit of discipline is what actually protects the 10 year/150,000 mile interval Mopar engineered into this chemistry.
— michael
Book dealer service or buy genuine Mopar coolant by VIN
We keep this simple for owners who want certainty instead of a guessing game at the parts counter. Our service department performs VIN-verified coolant flushes and refills using genuine Mopar fluid, and our parts department can match the exact coolant specification to your vehicle before you buy anything.
VIN-verified Mopar parts, including the correct coolant concentrate or premix for your model year.
Professional flush and refill, with the equipment to clear sediment or mixed chemistries completely.
Appointment booking, so you can get on the schedule without the back and forth.
Reach out through our service department to book a visit, or check our parts department for genuine Mopar coolant matched to your VIN.
FAQ
What coolant is equivalent to Mopar?
A true equivalent is any coolant whose technical data sheet or safety data sheet explicitly cites MS-90032 or MS-12106, the Chrysler material standards for OAT coolant. A “universal” label alone doesn’t confirm compatibility, so check the spec sheet rather than the color or the word on the bottle.
Is Mopar coolant HOAT or OAT?
Mopar’s current coolant for 2013 and later vehicles is OAT, or organic additive technology, conforming to MS-90032. Older Chrysler vehicles used HOAT coolant, which is a different chemistry and should never be mixed with the newer OAT formula.
Where can I buy genuine Mopar coolant?
Genuine Mopar coolant is available through authorized dealer parts departments, where staff can confirm the correct part number using your VIN. Our parts department carries genuine Mopar coolant and can match it to your specific vehicle.
Can I buy Mopar antifreeze at a general auto parts retailer?
Availability varies by retailer and location, and some auto parts stores do carry Mopar-branded antifreeze alongside other OAT coolants. Confirming the part number against your VIN before buying, whether at a retailer or a dealer, is the most reliable way to get the correct product.
What happens if I accidentally mix coolant types?
Mixing OAT with HOAT or IAT coolant can cause the inhibitor additives to drop out of solution, forming a gelatinous sludge that clogs cooling passages. The service bulletin on the OAT transition recommends a professional drain, flush, and refill as soon as mixing is suspected.
Sources
Service Bulletin 07-004-12 REV. A — Release of New Engine Coolant OAT
68163849AC - Coolant Antifreeze, US 2012-2026 Mopar (Mopar Parts Store)
Primary sources: Mopar owner manuals, service bulletin, and MS-90032 guidance
The recommendations above come directly from Mopar’s own published service information and the technical explanations built around its material standards. The Ram 2500/3500 owner’s manual lays out the official recommendation for 10 Year/150,000 Mile OAT coolant conforming to MS-90032, along with water-quality guidance for mixing concentrate. Service Bulletin 07-004-12 documents Chrysler’s 2013 switch to OAT chemistry and spells out the risks of mixing coolant technologies, including corrosion and sludge formation. A deeper explanation of how MS-90032 relates to MS-12106 clarifies why both standards point to the same underlying chemistry and how Mopar’s own part-number revisions reflect labeling changes rather than formula changes. Finally, Mopar’s parts store listing for part number 68163849AC confirms the current OEM SKU structure for owners checking against their own vehicle.