Diamond Oil Field Services Inc is an active intrastate non-hazmat carrier based in El Reno, OK.
No insurance filings on record.
View on FMCSA L&I| Vehicle Type | Owned | Term Leased | Trip Leased |
|---|---|---|---|
| Straight Trucks | 2 | 0 | 0 |
| Tractors | 18 | 0 | 0 |
| Trailers | 43 | 0 | 0 |
| Total Power Units | 20 | ||
Distinct vehicles · 24 mo
vs 20 self-reported (MCS-150)
Top makes
Registered in
Higher values = more violations. 0 = clean record.
| Category | Insp w/ Viol |
|---|
| Category | vs. Cohort | vs. State | Reading |
|---|---|---|---|
| Unsafe Driving | 88% | 95% | Worse than most peers |
| HOS Compliance | 0% | 0% | Better than most peers |
| Driver Fitness | 0% | 0% | Better than most peers |
| Controlled Substances | 0% | 0% | Better than most peers |
| Vehicle Maintenance | 46% | 86% | Around peer average |
Lower percentile = lower SMS measure = stronger safety record. Computed nightly across active carriers in the same state and fleet-size band.
| Type | Inspections | OOS | OOS % | Nat'l Avg |
|---|---|---|---|---|
| Driver | 0 | 0 | — | 6.67% |
| Vehicle | 0 | 0 | — | 22.26% |
| Hazmat | 0 | 0 | — |
| Period | Fatalities | Injuries | Tow-away | Total |
|---|---|---|---|---|
| Jul 1, 2024 | 0 | 0 | 1 | 1 |
Most-cited violation codes
| BASIC Category | Total | Severe | OOS |
|---|---|---|---|
| Vehicle Maintenance | 9 | 4 | 0 |
| Date | State | Vehicle | Violations | OOS |
|---|---|---|---|---|
| Feb 10, 2026 | OK | TRUCK TRACTOR | 1 | 0 |
| Jan 1, 2026 | OK | TRUCK TRACTOR | 1 | 0 |
| Dec 24, 2025 | OK | TRUCK TRACTOR | 0 | 0 |
| Dec 9, 2025 | OK | TRUCK TRACTOR | 0 | 0 |
| Sep 23, 2025 |
| Measure |
|---|
| Alert |
|---|
| Unsafe Driving | 3 | 2.81 | — |
| HOS Compliance | 0 | 0.00 | — |
| Vehicle Maintenance | 5 | 3.10 | — |
| Driver Fitness | 0 | 0.00 | — |
| Controlled Substances | 0 | 0.00 | — |
| 4.44% |
Where they run
Inspected in 1 state. Top state OK accounts for 100% of activity. Activity outside home state (OK): 0%.
| Unsafe Driving |
| 3 |
| 2 |
| 0 |
| OK |
| TRUCK TRACTOR |
| 2 |
| 0 |
| Sep 10, 2025 | OK | TRUCK TRACTOR | 0 | 0 |
| Sep 5, 2025 | OK | TRUCK TRACTOR | 3 | 0 |
| Aug 20, 2025 | OK | TRUCK TRACTOR | 0 | 0 |
| Jul 31, 2025 | OK | TRUCK TRACTOR | 0 | 0 |
| Jul 8, 2025 | OK | TRUCK TRACTOR | 0 | 0 |
| Date | Code | Description | BASIC | OOS |
|---|---|---|---|---|
| Feb 10, 2026 | 39216D | Driver - Failed to use seat belt while operating a CMV | Unsafe Driving | — |
| Jan 1, 2026 | 3922SLLS2 | State/Local Laws - Speeding 6-10 miles per hour over the speed limit | Unsafe Driving | — |
| Sep 23, 2025 | 39216AD | Driver - Failed to use seat belt while operating a CMV. | Unsafe Driving | — |
| Sep 23, 2025 | 3965BL | Lubrication - Oil or grease leak | Vehicle Maintenance | — |
| Sep 5, 2025 | 3939ALRLI | Lighting - Tail lamp - Any inoperative | Vehicle Maintenance | — |
| Sep 5, 2025 | 3939ALSLI | Lighting - Stop lamps - Any inoperative. | Vehicle Maintenance | — |
| Sep 5, 2025 | 3939ALTSIR | Lighting - Turn signal -Any inoperative on a unit that is not the rearmost unit | Vehicle Maintenance | — |
| Jun 2, 2025 | 39395A1 | Emergency Equipment - Fire Extinguishers - no fire extinguisher present or not properly rated. | Vehicle Maintenance | — |
| Nov 21, 2024 | 39347E | Brake Out of Adjustment - Roto Clamp (Short & Long) DD-3 or Bolt | Vehicle Maintenance | — |
| Nov 21, 2024 | 39353B | CMV manufactured after 10/19/94 has an automatic airbrake adjustment system that fails to compensate for wear | Vehicle Maintenance | — |