A Contractor's Guide to Oil-Fouling Treatment

Key takeaways

• An oil-fouling treatment is not a leak sealant; leaks still need a real repair and verification tests.
• Ask for the SDS and compatibility reports that name your refrigerant and oil pairs, including any A2Ls.
• Fix charge, airflow and dirty coils before the baseline, then compare split, subcooling, superheat and kW per ton at matched conditions.
• Tell customers what the company claims and what you will measure; never promise a savings number.
• Contractors can contact CryogenX4 about installing or recommending the treatment.

Facility owners who hear about an oil-fouling treatment usually ask the same person first: their HVAC/R service contractor. That puts you in the position of answering questions about a product you did not specify, on equipment you are responsible for. This guide gives the technician's view: what CRYOGENX4 is (in the company's own description), the compatibility and recovery questions worth asking, how it differs from a leak sealant, how to measure a unit before and after on a normal service call, and how to talk about it with a customer without overselling. It ends with how to contact the company if you want to install or recommend the treatment.

What the treatment is, in the company's words

CryogenX4 describes CRYOGENX4 as a one-time nano-fluid treatment injected into an existing HVAC-R system while it runs. According to the company, installation causes no downtime, needs no modifications to the system, takes one day for most installs, and is done by trained, certified technicians. The company states the treatment is intended to last for the remaining life of the equipment.

The mechanism, as the company explains it, will sound familiar to anyone who has dealt with oil return problems. A small amount of compressor oil migrates past the compressor seals, circulates with the refrigerant and coats internal coil surfaces, forming an insulating film. CryogenX4 says its polarized molecules lift that oil and return it to the sump, condition the metal surfaces for better heat transfer, and improve the lubricity of the existing oil, reducing friction and compressor heat. For the company's own explanation, see how it works.

The company reports energy savings of up to 30% and a typical payback of 12 to 36 months, with results varying by equipment condition. It reports more than 50,000 units and 500,000 tons treated, on equipment from 1-ton air-cooled split units to 1,600-ton water-cooled chillers. Treat those as the company's statements, and treat your own measurements as the evidence that matters on any given unit.

Compatibility questions contractors ask

Anything added to a sealed circuit has to coexist with the refrigerant, the lubricant, metals, elastomers, the filter-drier and your service equipment for years. These are the questions worth asking of any additive, and what is known about CRYOGENX4 on each.

On A2L work specifically, an ACHR News guide for refrigeration instructors notes that equipment used on A2L systems must be rated for A2Ls to avoid creating sparks, that A2L recovery cylinders are identified by a red band and use left-hand threads, and that refrigerant detection systems must warn before a leak reaches the lower flammability limit. Any injection procedure on an A2L system should follow the same discipline as any other service connection. The full compatibility picture, including lubricant families and how sealed-tube testing works, is in our compatibility and safety guide.

How it differs from a leak sealant

Most of the field's skepticism about "stuff in a can" comes from sealants, and it is earned. Sealants are designed to react and harden where they meet air or moisture at a leak. ACHR News has reported that refrigerant contaminated with hydrocarbon-propelled sealant may be surcharged or rejected by reclaimers, and that it is good practice to know whether a system contains sealant before you recover from it; detection tools exist for that check.

An oil-fouling treatment is a different category. It is not meant to stop leaks, and CryogenX4 does not describe its product as a leak repair. The practical distinctions:

• Purpose: a sealant targets a leak site; an oil-fouling treatment, as the company describes it, targets the oil film on internal heat-exchanger surfaces and the condition of the existing oil.
• Regulatory fit: a sealant is not a documented repair. Leaks on covered appliances still need a real repair and verification tests (see the Section 608 notes below), whatever is in the system.
• Precondition: any treatment should go into a system that is tight and correctly charged. If the system is leaking, fix the leak first.

Our side-by-side oil-fouling treatment vs. refrigerant sealant comparison goes further. Whatever goes into a system, tag the unit and log the product, date and quantity so the next technician knows before connecting gauges.

Measuring before and after on a service call

You do not need a full measurement and verification (M&V) project to see whether a unit has changed, but you do need to measure the same things the same way. The point of the "before" visit is to rule out the ordinary faults first: an oil-film treatment should not be the answer to a dirty condenser, a low charge or a slipping belt. Our field guide to diagnosing efficiency loss walks through those patterns.

The readings

John Tomczyk's troubleshooting checklist in ACHR News lists the core set: discharge, condenser outlet, evaporator outlet, compressor inlet, ambient and space temperatures; compressor volts and amps; and low-side and high-side pressures converted to saturation temperatures. From those you calculate:

• Condenser split (approach on air-cooled units): condensing temperature minus ambient. A high split with high head pressure and high amps points first to a dirty condenser or restricted airflow.
• Subcooling: condensing (saturation) temperature minus liquid temperature at the condenser outlet. Very high subcooling can indicate an overcharge.
• Evaporator superheat: evaporator outlet temperature minus evaporator saturation temperature.
• Compressor superheat: compressor inlet temperature minus evaporator saturation temperature.

As ACHR News explains, superheat is the rise in vapor temperature above saturation at a given pressure, and subcooling is the drop in liquid temperature below saturation. On water-cooled chillers, add condenser and evaporator approach temperatures (refrigerant saturation temperature versus leaving water temperature), which most chiller controllers log.

Getting to kW per ton

Amps alone move with voltage, load and outdoor conditions, so a single amp reading before and after proves little. Where you can, log true power (kW) with a power meter and estimate cooling output. On a chiller, output comes from chilled-water flow and the entering-to-leaving temperature difference. On packaged and split equipment, it comes from airflow and the enthalpy change across the coil, which means measuring entering and leaving wet-bulb as well as dry-bulb temperatures. Divide kW by tons to get kW per ton.

Making the comparison fair

1. Clean coils, verify airflow and charge, and fix leaks before the baseline, not between baseline and treatment.
2. Record conditions with every reading: outdoor dry-bulb, indoor return conditions, load or stage, setpoints.
3. Take repeated readings at similar outdoor temperatures and loads rather than a single snapshot.
4. Better still, leave a data logger on power and key temperatures for a few weeks before and after, then compare at matched conditions.

For anything a customer will use to justify a larger purchase, recommend a proper M&V plan. The International Performance Measurement and Verification Protocol (IPMVP), published by the Efficiency Valuation Organization, uses retrofit-isolation Options A and B for measures on specific equipment, which is the usual fit here. Our pages on IPMVP options and what a pilot measures describe the setup.

EPA Section 608 context

• Certification: EPA requires technicians who attach gauges, add or remove refrigerant, or otherwise open a system to hold Section 608 certification for the equipment type: Type I (small appliances), Type II (high-pressure), Type III (low-pressure) or Universal. EPA states the credentials do not expire. Anyone connecting to a system to inject a treatment is doing that kind of work.
• Leak repair: under Section 608, appliances with 50 pounds or more of ozone-depleting refrigerant that exceed trigger leak rates (30% industrial process refrigeration, 20% commercial refrigeration, 10% comfort cooling and others) must be repaired within 30 days and confirmed with initial and follow-up verification tests.
• HFC equipment from 2026: according to a Beveridge & Diamond summary of EPA's 2024 Emissions Reduction and Reclamation rule, leak-repair requirements extend to appliances with 15 pounds or more of an HFC refrigerant with a GWP above 53, with a compliance date of January 1, 2026 and a narrow exemption for residential and light commercial AC and heat pumps. Reclaimed HFC for servicing certain existing equipment does not start until January 1, 2029. Check EPA's current text before relying on these dates.

The practical point: no additive changes your leak-repair obligations, and anything that contaminates recovered refrigerant has a real cost under a regime built on recovery and reclamation.

Talking about it with a customer honestly

Customers ask contractors because they trust them to say what they know and what they do not. A few approaches that protect that trust:

• Separate the claim from the evidence. "The company reports savings of up to 30%, and results vary by equipment condition. On your units, we would measure before and after."
• Fix the basics first. If the unit has a dirty condenser or a low charge, say so, fix it, and measure again before talking about any treatment.
• Pilot before fleet. One to three representative units, measured properly, answer the question for that site. A pilot measured to a written plan is far more persuasive than a brochure.
• Check the warranty. For in-warranty equipment, ask the OEM before treating, and document the answer.
• Put the documents in the file. The SDS, compatibility report, product and quantity, date, technician and pre- and post-readings belong in the equipment record.
• Do not promise numbers. No one can tell a customer in advance what their unit will save.

Working with CryogenX4

If you service equipment where a customer has asked about the treatment, or you want to discuss installing or recommending it, you can contact CryogenX4 directly at 713-396-6425 or through the contact page. Ask the company how installation is handled in your area, what training or certification it requires of installers, and what documentation it provides for your customer's file. Ask, too, for the full reports behind the testing the company cites on its website. Use the form below to tell the company about your business and the equipment you service, so the company can follow up with you.

Contractor inquiry

Name *Email * PhoneCompany * Service areaMain work What would you like to discuss? Send inquiry

Frequently asked questions

Do I need Section 608 certification to inject a treatment?

EPA requires certification for technicians who attach gauges, add or remove refrigerant, or otherwise open a system, so connecting to a circuit to inject any product falls under that work. Use the certification type that matches the equipment.

Can I recover refrigerant from a treated system with my normal recovery machine?

Ask the company for its recovery guidance and the Safety Data Sheet before you treat. The well-documented recovery problems in the trade come from sealants, especially those with hydrocarbon propellants, which is why logging what went into a system matters.

Will a single amp reading show whether the treatment worked?

No. Amps move with voltage, load and outdoor conditions. Compare power and cooling output at similar conditions, ideally from logged data before and after, and calculate kW per ton.

Does CryogenX4 offer a partner or dealer program?

This page does not describe any program terms. Contact the company directly with your questions about installation, training and documentation.

Sources

1. Section 608 Technician Certification Requirements — U.S. EPA
2. Stationary Refrigeration Leak Repair Requirements — U.S. EPA
3. EPA Finalizes HFC Emissions Reduction and Reclamation Program — Beveridge & Diamond
4. Sealers: Friend or Foe? — ACHR News
5. Teaching A2Ls: A Guide for Refrigeration Instructors — ACHR News
6. Creating the Ultimate Refrigeration Troubleshooting Checklist — ACHR News
7. Superheat, Subcooling and Saturation: What Do They Mean? — ACHR News
8. International Performance Measurement and Verification Protocol (IPMVP) — Efficiency Valuation Organization