What Is Oil Analysis and Why Does It Matter?
Oil analysis is a proactive maintenance technique where small samples of engine oil, hydraulic oil, or transmission fluid are sent to a laboratory for analysis. The lab tests for wear metals (iron, copper, aluminium, chromium), contamination markers (silicon for dirt, water content, fuel dilution), and oil condition (viscosity, TAN/TBN depletion, oxidation). For a Volvo CE machine working 2,000+ hours per year, regular oil analysis can predict component failures weeks or months before they happen — saving emergency breakdown costs that can be 5–10× higher than planned repairs.
What Oil Analysis Tests for — Parameters Explained
| Parameter | What High Values Mean | Typical Limit |
|---|---|---|
| Iron (Fe) ppm | Cylinder liner, crankshaft, gearbox wear | >100 ppm — investigate |
| Copper (Cu) ppm | Bearing, bushing, thrust washer wear | >30 ppm — investigate |
| Aluminium (Al) ppm | Piston, bearing alloy, pump wear | >25 ppm — investigate |
| Silicon (Si) ppm | Dirt/dust contamination — air filter failure | >20 ppm — change oil + check filter |
| Chromium (Cr) ppm | Piston ring, cylinder liner wear | >15 ppm — investigate |
| Lead (Pb) ppm | Bearing material, fuel additive carry-over | >20 ppm — investigate |
| Water content % | Coolant leak or condensation | >0.2% — find and fix source immediately |
| Viscosity @ 40°C | Correct grade in use, oil degradation | Must be within ±20% of new oil spec |
| TAN (Total Acid Number) | Oil oxidation / additive depletion | >4× new oil TAN — change oil |
| Fuel dilution % | Injector leakage, short-trip operation | >2% — investigate injectors |
How Often to Sample Oil
Volvo CE recommends oil sampling every 250–500 hours depending on machine application. For machines in clean conditions (indoor demolition, light earthworks), 500-hour sampling is adequate. For machines in harsh environments (quarrying, mining, tropical heat), sample every 250 hours. The trend over multiple samples is more valuable than any single result — a rising iron count over three consecutive samples is a stronger indicator than one high reading.
Oil analysis showing high wear metals on your Volvo machine? Share the results and we can help identify which components to inspect and which parts to stock up on.
Oil Analysis for Different Fluids
| Fluid | Key Tests | Sample Interval |
|---|---|---|
| Engine Oil | Fe, Cu, Si, water, fuel dilution, viscosity, TAN | 250–500 hrs |
| Hydraulic Oil | Fe, Cu, Si, water, viscosity, cleanliness (ISO 4406) | 500 hrs |
| Transmission Fluid | Fe, Cu, Al, viscosity | 1,000 hrs |
| Swing/Travel Gearbox | Fe, Cu, water | 1,000 hrs |
| Axle Hub Oil (wheel loaders) | Fe, Cu, water | 1,000 hrs |
| Coolant | pH, SCA level, Cu, Fe (corrosion), Cl (contamination) | Annual |
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