DARRINGTON GEAR OIL

Gearbox Oil Analysis –

Sample History

• Start Sample – 08.07.25 (Before Kleenoil) o Too dirty to carry out a particle count. ▪

Reason: Heavy contamination levels exceeded the calibration range of the particle counter, so no ISO code could be assigned. Oil also had a visible haze, indicating high solid & water contamination.

Key values: ▪

o

Viscosity: 115.1 cSt (in spec for gear oil grade) ▪ Water: 123 ppm (borderline high) ▪ PQ Index: 35 (high ferrous debris) ▪ Metals: Fe 59, Cu 60, Pb 38 — severe wear present ▪ Additives: Phos 237, Zn 29, Ca 46 (normal baseline)

• 2nd Sample – 15.07.25 (7 days after installation of Kleenoil) o Condition already improving: ▪ Viscosity: 117.7 (stable, no breakdown) ▪ Water: 71 ppm (↓ from 123 – filtration & settling already reducing moisture) ▪ PQ: 9 (↓ from 35 – less ferrous debris circulating) ▪ ISO: 24/22/15 (still dirty, but measurable – counts very high at >4 µm = 102,574/ml) ▪ Metals: Fe 20, Cu 22, Pb 27 — sharp reduction in wear metal levels within just 1 week ▪ Additives: trending slightly down as contaminated oil is diluted out, still functional • 3rd Sample – 21.07.25 (ongoing after 2 weeks with Kleenoil) o Marked improvement: ▪ Viscosity: 117.2 (stable) ▪ Water: 59 ppm (↓ further from 123 → 71 → 59 ppm – under control now) ▪ PQ: 3 (very low, ↓ from 35 start value – ferrous debris nearly eliminated) ▪ ISO: 21/19/11 ▪ 14 µm: 18/ml (↓ 92% from 227/ml) ▪ 6 µm: 2,684/ml (↓ 88% from 23,120/ml) ▪ 4 µm: 19,522/ml (↓ 81% from 102,574/ml) → Achieved a 3 - class improvement from 24/22/15 → 21/19/11 in just 2 weeks. ▪ Metals: Fe 8, Cu 5, Pb 21 — all trending down (wear generation slowing, old debris removed) ▪ Additives: P/Zn/Ca gradually falling as oil is cleaned — expected as contaminated fraction is removed.