HaulerCheck · https://haulercheck.com/carrier/554371-diamond-oil-company/ · Checked 2026-10-20 09:05 UTC · Census and inspections Oct 19, 2026 · Authority and insurance: Last known · FMCSA snapshot May 14, 2026
DIAMOND OIL COMPANY
No risk signals in the last-known data
How risk signals workNothing in the FMCSA record matched our risk signals. That is not a guarantee, and it does not confirm who you are talking to; follow the checks below. Authority and insurance are last known from May 14, 2026.
- Registration (MCS-150) last updated 2 years agoFleet size and contact details on the registration may be out of date.
Cargo cover filed: amount not published
Not a live check. FMCSA has not published a Motus record for this carrier, so authority and insurance show the last known status from May 14, 2026. Confirm on Motus ↗ before booking.
What to verify next
- Confirm authority and insurance on the official Motus record ↗: our copy is the last known status from May 14, 2026. Safety record: SAFER ↗.
- Call back on the number on file, (515) 244-4271, not a number from an email or load board.
- Check that the MC number you were given is MC383794.
- Ask the insurer for a certificate of insurance naming you as holder, with cargo coverage that fits your load.
Insurance on file
Liability (BI&PD) pays for injury and damage to other people and property; it does not cover the freight. Cargo insurance covers the freight. FMCSA only requires cargo filings from household goods carriers and freight forwarders, so most carriers file none: ask for a cargo certificate that fits your load. Cargo cover filed: amount not published.
| Type | Docket | Layer | Insurer | Coverage | Effective | Status |
|---|---|---|---|---|---|---|
| Cargo | MC383794 | — | FEDERATED MUTUAL INSURANCE CO. Policy 6026295 · 34 | — | Dec 1, 2001 | Active |
| Liability (BI&PD) | MC383794 | Primary | EMCASCO INSURANCE COMPANY Policy 6E60686 · 91X | $750,000 | Dec 1, 2023 | Active |
| Liability (BI&PD) | MC383794 | Excess over $1,000,000 | FEDERATED MUTUAL INSURANCE CO. Policy 6026296 · 91X | $4,000,000 | Dec 1, 2001 | Active |
Source: Last known · FMCSA snapshot May 14, 2026. Identical filings repeated in the FMCSA data are shown once; a filing listed under two dockets is one policy, not extra coverage. Coverage is the maximum amount filed with FMCSA, not the full policy.
Last known filings. Insurance for this carrier comes from the FMCSA snapshot of May 14, 2026. Policies may have been cancelled or replaced since. Confirm current filings: Motus record ↗ and ask the insurer for a certificate naming you as holder.
Roadside inspections Oct 19, 2024 – Oct 19, 2026
2 of 4 · Iowa avg 22.1%
0 of 6 · Iowa avg 3.1%
By quarter inspections and vehicle out-of-service rate
Bar height: inspections in the quarter. Percentage: vehicles put out of service, of vehicle inspections. The first and last quarters are partial.
Where it was inspected 3 states and provinces, 24 months
- IA 4 66.7%
- NE 1 16.7%
- SD 1 16.7%
Vehicles seen at inspections different VINs, 24 months
Power units: 6
4 straight trucks · 2 tractors
Kenworth 4International 1Western Star 1
43 power units declared on the MCS-150. Inspections see only part of a fleet, so fewer here is normal; many more can mean the registration is out of date.
Trailers: 2
2 semi-trailers
Includes trailers the company pulled but does not own, such as shipper or leasing trailers.
6 most recent inspections
| Date | State | Level | Violations | Out of service |
|---|---|---|---|---|
| Jul 18, 2025 | IA | 3 | 1 | No |
| Jan 16, 2025 | SD | 2 | 1 | Yes |
| Dec 23, 2024 | IA | 2 | 0 | No |
| Dec 17, 2024 | IA | 2 | 11 | Yes |
| Dec 4, 2024 | NE | 3 | 0 | No |
| Nov 20, 2024 | IA | 2 | 1 | No |
How these rates are calculated
Period: Oct 19, 2024 – Oct 19, 2026. Vehicle rate = vehicle inspections with a vehicle out-of-service order ÷ vehicle inspections (levels 1, 2, 5 and 6). Driver rate uses levels 1, 2, 3 and 6. The Iowa average covers 31,590 vehicle and 64,972 driver inspections of all Iowa-based carriers in this period. It mixes every type of operation, so compare with care; rates based on a handful of inspections say little. FMCSA's own SMS measures are weighted differently: SMS profile ↗ · SAFER snapshot ↗
Violations in FMCSA's SMS last 24 months
9 violations counted in FMCSA's Safety Measurement System (SMS), 2 of them serious enough to put the driver or vehicle out of service.
Why is this different from the 14 violations above?
The inspections section's number counts every violation written on the inspection reports in our Oct 19, 2024 – Oct 19, 2026 window. The SMS count comes from FMCSA's own monthly SMS snapshot, which uses its own 24-month window and only the violations it scores. Both are FMCSA figures; they measure different things.
| Category (FMCSA BASIC) | Violations | Out of service | Share | Iowa share |
|---|---|---|---|---|
| Vehicle Maintenance | 5 | 2 | 55.6% | 60.1% |
| Hours-of-Service Compliance | 3 | 0 | 33.3% | 12.5% |
| Unsafe Driving | 1 | 0 | 11.1% | 23.4% |
8 most frequent violations
| Violation | Times | Out of service |
|---|---|---|
| Inoperable Required Lamp Clearance Identification Lamps/Other · Vehicle Maintenance · code 3939 | 2 | 0 |
| Brake Hose or Tubing Chafing and/or Kinking - Connection to Power Unit Brakes All Others · Vehicle Maintenance · code 39345B2PC | 1 | 1 |
| Tires - All others leaking in tread area and inflation less than 50% of the maximum inflation pressure on tire equipped with ATIS Tires · Vehicle Maintenance · code 39375A3TAOLTIS | 1 | 1 |
| Portable ELD not mounted in a fixed position and visible to driver EOBR Related · Hours-of-Service Compliance · code 39522G | 1 | 0 |
| False report of drivers record of duty status False Log · Hours-of-Service Compliance · code 3958E | 1 | 0 |
| Driver failed to manually add shipping document number Other Log/Form & Manner · Hours-of-Service Compliance · code 39524C2III | 1 | 0 |
| State/Local Laws - Speeding 6-10 miles per hour over the speed limit Speeding 2 · Unsafe Driving · code 3922SLLS2 | 1 | 0 |
| Truck-Tractor lower rear mud flaps retroreflective sheeting / reflex reflective material requirements for vehicles manufactured after July 1997 Reflective Sheeting · Vehicle Maintenance · code 39311TL | 1 | 0 |
Source: FMCSA SMS violation file, inspections in the last 24 months, published Oct 19, 2026. "Share" is this company's mix of violations; the Iowa column is the mix across all Iowa-based carriers, so you can see which kinds of problems stand out. A high count partly reflects fleet size and how often trucks are inspected.
Crashes Oct 19, 2024 – Oct 19, 2026
No reportable crashes in this period.
Company details FMCSA census · Oct 19, 2026
| USDOT number | 554371 |
|---|---|
| MC / docket | MC383794 |
| Legal name | DIAMOND OIL COMPANY |
| Operation | Interstate |
| Business type | Corporation |
| Power units | 43 |
| Drivers | 32 |
| Annual mileage | 1,200,000 (2023) |
| Hazmat | Yes |
| Safety rating | Satisfactory (May 30, 2019) |
| USDOT number added | Mar 23, 1994 · 32 years ago |
| Last MCS-150 update | Feb 28, 2024 |
| Email domain on file | @diamondoilco.com |
Equipment as declared on the MCS-150
| Owned | Term-leased | |
|---|---|---|
| Tractors | 12 | 0 |
| Straight trucks | 6 | 0 |
| Trailers | 10 | 0 |
Term-leased equipment usually belongs to owner-operators driving under this company's authority.
Cargo carried
Liquids/GasesChemicalsPaper ProductsAgricultural/Farm SuppliesOtherScrap Metal
Change history
No changes to name, contact details, authority or insurance since we started tracking on Oct 18, 2026. We compare every company's FMCSA record each day.
to see it on your watchlist when something changes.
Questions about DIAMOND OIL COMPANY
What does DIAMOND OIL COMPANY's operating authority allow?
MC383794: Contract carrier (may haul regulated property for hire under continuing contracts with specific shippers).
Which information about DIAMOND OIL COMPANY is old or missing?
Operating authority is the last known status from the FMCSA snapshot of May 14, 2026, not a current check. Insurance filings are from the same May 14, 2026 snapshot. There are too few vehicle inspections in the last 24 months to judge the out-of-service rate. The MCS-150 was last updated Feb 28, 2024, so fleet size and contact details may be out of date.
What should I verify before booking DIAMOND OIL COMPANY?
Confirm the authority and insurance on the Motus record for USDOT 554371. Call the company back on the phone number on file, (515) 244-4271, not a number from an email or load board message. Check that the MC number the dispatcher gave you matches MC383794, and ask the insurer for a certificate of insurance naming you as holder, with cargo coverage that fits your load.
Other trucking companies in Des Moines, IA →
Company details from the FMCSA Company Census File (Oct 19, 2026). Inspections and crashes from FMCSA MCMIS files. About our data · Report an error on this page (how corrections work).
Page generated 2026-10-20 09:05 UTC.