8 Keys to Oil Analysis Victory: Key #1 – MPC Testing 101

All Resources / FAQs

8 Keys to Oil Analysis Victory

In power plants and other critical operations, oil condition is one of the most significant contributors to turbine reliability, yet it’s often overlooked until alarms start ringing. By the time warning signs appear, the real problem has often been developing quietly for months or even years.

The truth is simple: lubricants rarely fail suddenly. They typically fail after prolonged neglect.

Early in a lubricant’s life, few visible problems appear, making it easy to ignore the gradual chemical changes happening inside the system. Over time, however, unmanaged degradation begins to surface:

Rising MPC varnish potential
Additive depletion
Accumulation of oxidation byproducts that deposit on equipment surfaces

At EPT Clean Oil^™ our goal is simple: to teach the world a better way through Lubricant Chemistry Management. Because success in lubrication reliability doesn’t come from a single test or a single insight. It comes from understanding the lubricant’s chemistry and managing it strategically over time. That’s why we developed The 8 Keys to Oil Analysis Victory.

These eight tests form the foundation of a winning lubricant management strategy. Think of them as the core plays in your reliability playbook and the insights that allow your team to:

Understand where your lubricant is strongest
Identify weaknesses before they become failures
Make informed adjustments before equipment performance is impacted

Key #1: MPC Testing

Did you know? The #1 cause of lubricant-related downtime: varnish. That is why MPC varnish potential testing should be number 1 for every team’s playbook for success! It reveals what other tests can’t, giving you early warning of problems before they happen, like having the other team’s playbook before the game even starts.

What is MPC testing?

MPC is a varnish-potential test that captures insoluble contaminants on a filter patch and measures its color to trend oxidation byproducts, helping prevent varnish-related failures in turbines, compressors, and hydraulic systems. Essential for gas turbines and critical rotating equipment, finding the contaminants that standard tests miss. MPC helps reveal “what’s coming” before deposits form, making it a predictive test rather than a reactive one.

Why does it matter?

Catch the “invisible” enemy. Varnish stays dissolved and invisible for a long time. Standard visual checks often look perfect even when a system is at risk. By the time you see deposits, the damage is already done. MPC is predictive, not reactive. It reveals what’s coming before it sticks to your bearings and valves.

How does MPC Testing work?

The science behind the stain:
Incubation: The oil is heated and “rested” to force varnish precursors out of solution.
Filtration: Oil is pulled through a 0.45-micron membrane patch.
Measurement: A colorimeter analyzes the patch to find the Delta (Δ) E value.

How to read MPC test results?

The patch is measured with a colorimeter, producing a ΔE value.
The lower ΔE = cleaner patch = lower varnish potential
The higher ΔE = darker/more stained patch = higher varnish potential and higher deposit risk

Stop Guessing, Start Trending

Our Fluid Technical Center team takes the routine out of oil analysis, providing a complete picture of your fluid condition to ASTM standards. Testing packages are designed for each application and performed by professional chemists, delivering accurate, actionable results.

Data is reviewed and interpreted by application specialists and PhD chemists to provide a comprehensive overview of your samples and deeper insight into root cause. As part of our ACE™ assessment, advanced testing including MPC Testing is performed to provide deeper insight into varnish potential and overall fluid health, empowering you to make data-informed decisions about your critical assets.

It’s as easy as 1, 2, 3.