What’s Lurking in Your Oil Filter and How we Test for it

Feb 25, 2025 | General

Why Filter Analysis Tells the Full Story

When it comes to keeping your machinery running smoothly, oil analysis is the go-to move. It gives you a quick health check on your lubricant, machine, and contamination levels—all from one tiny sample. But here’s the thing: it’s just a snapshot. Like a single frame from a movie, it only shows what was happening the moment that oil was pulled. Sometimes, you need the full story.

Enter filter analysis

Think of your oil filter as your machine’s diary. It quietly collects bits and pieces of the machine’s life—wear debris, contaminants, and particles that are too big to float around in the oil. While traditional oil analysis might miss these larger particles (especially in systems with huge sump volumes where debris gets super diluted), the filter holds onto them, waiting to spill its secrets.

Piece of aluminium from a sudden death of an engine that had recently been overhauled. Note that the hone marks are still visible on the piece of debris. Analysis also revealed a high level of coarse dirt which may have been the cause of failure.

So, how do we crack it open?

We take a small piece of the filter and give it a good shake with special solvents to loosen up all the trapped debris. That mix gets filtered through a fine membrane, and then the fun starts. Under the microscope, we get to play detective—spotting and identifying metals like iron, copper, aluminium, and white metal. But it’s not just about metals. We also catch dirt, rust, carbon grit, and even sticky oil residues.

Then, we measure the mass of all that debris and its PQI (Particle Quantifier Index) to understand how much wear is really happening. If something unusual pops up, we snap a pic, jot down what we see, and—here’s the kicker—we suggest what might be causing the issue and how to fix it.

The result? A detailed report (print or digital) that gives you a deeper look into your machinery’s health. So next time you’re wondering what’s really going on inside your machine, remember—it’s not just in the oil. The filter’s got stories to tell.

← Previous Post

For more information on filter analysis service, contact Chris Hattingh – chrish@lubrigard.co.za.

Post Reads 65