Carrier profile · USDOT 4151788 · Updated Jul 18, 2026

Markwest Energy Operating Company LLC

DBA MPLX G&P

122 power unitsavg 6.6 yrRegional · 3 statesDENVER, CO96/100
AUTHORITY STATUS UNKNOWN
Verified linksmarathonpetroleum.comFMCSA SAFER

Network & Fraud

Reincarnation chains, shared-VIN links, common domains and officers, and owner-group affiliations — the chameleon / double-broker signals that name-and-USDOT lookups miss.

No shared-VIN flow in the last 12 months

None of this carrier's trucks were inspected under another USDOT in the last 12 months — any shared equipment is historical, not active.
Show all-time history (2 trucks · 1 carriers)
Across all inspections on record: USDOT 1379760

Shares a registration email domain with other carriers

@marathonpetroleum.com — 11 carriers: USDOT 154090USDOT 311210USDOT 351594USDOT 1189299USDOT 1379760USDOT 2070369USDOT 2400808USDOT 2476826

Capacity consistency· registered vs roadside-observed power units

Registered (MCS-150)122
Observed (24 mo)4
Shared w/ other carriers2

Registered capacity materially exceeds what is observed roadside — the MCS-150 may be stale or the fleet under-utilized.

Shared-VIN cross-links· units inspected under more than one USDOT

VINCarriersInspectionsFirst seenLast seen
1GC4KXEY7KF200425View sourced platform decode22Feb 22, 2024Jan 30, 2025
4WXGE2628L1037584View sourced platform decode23Aug 31, 2023Jan 30, 2025

Owner / group view· confidence: email domain

Owner / group view

Affiliated authorities

Collapses 11 related authorities · joined by email domain

Authorities
11
Combined power
370
States
7
Oldest authority
Jun 1, 1974
Active now
11

Affiliated entities· hover to preview

MARATHON PIPE LINE LLCWESTERN REFINING SOUTHWEST LLCROBERT E WARNER JRST PAUL PARK REFINING COMPANY LLCCINCINNATI BIOREFINING FUELS LLCMARKWEST LIBERTY GAS GATHERING CO LLCBLANCHARD REFINING COMPANY LLCMARKWEST ENERGY APPALACHIA LLC