If you are comparing Detroit Power Cool Plus with Detroit Power Cool, the key difference is not just the name or price. It is the coolant chemistry.
Detroit Power Cool Plus is an extended-life OAT coolant. Detroit Power Cool is a conventional coolant pre-charged with SCAs. That difference affects service life, testing, top-ups, mixing rules, and long-term maintenance.
For buyers maintaining a Detroit engine, the right question is not “which one is better?” It is “which coolant strategy matches the engine and maintenance programme already in use?”
Detroit Power Cool Plus vs Detroit Power Cool at a Glance
| Feature | Detroit Power Cool Plus | Detroit Power Cool |
| Coolant type | Extended-life OAT coolant | Conventional coolant |
| Base | 50/50 ethylene glycol premix | 50/50 ethylene glycol premix |
| Additive strategy | Organic Acid Technology | Supplemental coolant additives |
| SCA maintenance | Not managed like conventional SCA coolant | Requires SCA/nitrite monitoring |
| Best fit | OAT extended-life systems | Conventional coolant systems |
| Mixing advice | Do not mix with conventional coolant | Do not mix with OAT coolant |
| Main benefit | Longer-life, lower-maintenance strategy | Suitable for SCA-managed systems |
The Fastest Way to Tell Them Apart
Detroit Power Cool PLUS 20L is listed as a ready-to-use, 50/50 extended-life ethylene glycol coolant using nitrite-free Organic Acid Technology.
Detroit Power Cool 20L is listed as a ready-to-use, 50/50 conventional ethylene glycol coolant pre-charged with supplemental coolant additives, or SCAs.
So this is not simply “Plus” versus “standard”. It is OAT extended-life coolant versus conventional SCA-managed coolant.
What Changes When You Move from Conventional Coolant to OAT?
Moving from conventional coolant to OAT changes the maintenance model.
OAT coolant uses an Organic Acid Technology corrosion package. It is designed for longer service life and reduced additive maintenance when used correctly.
Conventional coolant works differently. It relies on inhibitor levels, nitrite testing, and SCA maintenance. That approach can work well, but it needs more active monitoring.
This is why Power Cool Plus should not be treated as a simple upgrade for every engine. It only makes sense when the system is already suitable for OAT coolant or has been properly converted.
Service Life: How the Two Coolant Strategies Compare
Service life is one of the main reasons buyers compare these products.
Detroit guidance states that properly maintained OAT coolant may be used for up to 4 years, 600,000 miles, or 10,000 operating hours, whichever comes first.
Conventional fully formulated coolant usually follows a shorter maintenance schedule, often around 2 years, 300,000 miles, or 4,000 to 5,000 operating hours, depending on application and maintenance conditions.
Treat these as coolant-family guidance, not a blanket promise for every truck. The right interval depends on the engine, application, coolant condition, and maintenance history.
Can You Mix Detroit Power Cool Plus with Detroit Power Cool?
No. You should not intentionally mix OAT coolant with conventional coolant.
Detroit guidance warns that OAT coolants should not be mixed with conventional coolants. If they are mixed, the engine may not suffer immediate damage, but the long-life benefits of the OAT coolant are lost. The system should then be maintained as a conventional coolant system.
That mistake can create confusion. A driver may think they still have an extended-life coolant programme, when the coolant now needs conventional testing and additive management.
What Coolant Does a DD15 Need?
A DD15 does not automatically need Power Cool Plus or standard Power Cool in every situation.
The right coolant depends on what is already in the engine. If the DD15 is already running an OAT extended-life coolant programme, Detroit Power Cool Plus is the logical match. If it is being maintained as a conventional SCA-managed system, Detroit Power Cool may still be the correct choice.
Before topping up or refilling, confirm the coolant family already in use. Do not choose based on price or assume the more expensive product is automatically correct.
When Detroit Power Cool Plus Makes More Sense
Choose Detroit Power Cool Plus when:
- The system is already running OAT coolant
- You want to maintain an extended-life coolant programme
- You want reduced additive management
- The system has been properly converted to OAT
- You want to preserve the longer service-life benefits linked to OAT coolant
Power Cool Plus is the better fit when the maintenance strategy is already built around OAT.
When Standard Detroit Power Cool Still Makes Sense
Choose Detroit Power Cool when:
- The engine is already on a conventional coolant programme
- The system is managed with SCA testing and additive control
- You are topping up a conventional coolant system
- You are not converting the engine to OAT
- You want to stay within the existing maintenance approach
Standard Power Cool is not the weaker product by default. It is the right product when the engine is being maintained as a conventional coolant system.
Price Difference: Why Shelf Price Does Not Tell the Whole Story
AJK lists Detroit Power Cool PLUS 20L at $144.55 ex GST and Detroit Power Cool 20L at $122.50 ex GST.
That makes standard Power Cool cheaper on the shelf. But coolant choice should not be based on the drum price alone.
The cheaper product only makes sense if it matches the coolant programme already in the engine. The more expensive product only makes sense if the system is suitable for OAT coolant and maintained correctly.
BefBefore You Top Up or Switch Coolant, Check These First
Before ordering either product, check:
- What coolant chemistry is already in the engine?
- Are you topping up or doing a full drain-and-refill?
- Is the system managed as OAT or conventional coolant?
- Has the system been properly converted if changing coolant type?
- Are you using the correct maintenance approach after refill?
Coolant selection should also be supported by proper cooling-system inspection. A NSW Office of Transport Safety Investigations report found that coolant containing approximately 45% ethylene glycol had a flash point of about 120°C, while nearby components on comparable vehicles operated at around 110°C to 120°C. In the investigated incident, coolant leaking from a failed hose onto a hot engine surface initiated a fire.
This does not mean that OAT or conventional coolant is inherently unsafe. It reinforces the importance of checking hoses, clamps and signs of leakage whenever coolant is topped up, replaced or changed to another maintenance programme.
If you are unsure, check before ordering. Guessing can shorten coolant life and create unnecessary maintenance issues.
FAQ: Detroit Power Cool Plus vs Detroit Power Cool
Is Detroit Power Cool Plus just a better version of Detroit Power Cool?
No. It is a different coolant chemistry and maintenance strategy. Power Cool Plus is OAT extended-life coolant. Standard Power Cool is conventional coolant pre-charged with SCAs.
Can I mix Detroit Power Cool Plus with standard Detroit Power Cool?
No. OAT coolant should not be mixed with conventional coolant. If they are mixed, the long-life benefits of OAT are lost.
Why does conventional Detroit coolant use SCAs?
Conventional coolant uses supplemental coolant additives to maintain corrosion protection. These additives need monitoring and maintenance over time.
Does a DD15 need Power Cool Plus?
Not automatically. The right coolant depends on what is already in the engine and whether the system is being maintained as OAT or conventional coolant.
What happens if I top up with the wrong coolant?
The main risk is losing the correct maintenance strategy. Mixing OAT and conventional coolant can remove the extended-life benefit of OAT and force the system back into conventional coolant maintenance.
When should I stay with standard Power Cool?
Stay with standard Power Cool when the engine is already running a conventional coolant programme and you are maintaining it with the correct testing and SCA control.
Need Help Choosing the Right Detroit Coolant?
Do not choose coolant by price or product name alone. Choose the coolant that matches the engine, the coolant already in the system, and the maintenance strategy you plan to follow.
You can order Detroit Power Cool Plus 20L or Detroit Power Cool 20L from AJK Engines. If you are unsure which product is right for your engine, contact AJK Engines before ordering and we can help you confirm the best option.