SWEPCO | 306 Supreme Engine Oil | High-Zinc Multi-Grade | CI-4/SM

SWEPCO | 306 Supreme Engine Oil | High-Zinc Multi-Grade | CI-4/SMENGINE OIL ENGINEERED FOR LONG DRAIN & HEAVY LOAD ENGINES SWEPCO 306 Supreme Formula Engine Oil is designed for engines that never get a day offfleet diesels, high load off road equipment, and older gasoline or diesel vehicles. With extended drain capability up to 100,000 miles or 600 hours (LOA Program), this high zinc, solvent refined oil delivers proven wear protection, cleaner combustion, and serious uptime savings. Ideal for pre 2010 engines

ENGINE OIL ENGINEERED FOR LONG DRAIN & HEAVY-LOAD ENGINES

SWEPCO 306 Supreme Formula Engine Oil is designed for engines that never get a day off—fleet diesels, high-load off-road equipment, and older gasoline or diesel vehicles. With extended drain capability up to 100,000 miles or 600 hours (LOA Program), this high-zinc, solvent-refined oil delivers proven wear protection, cleaner combustion, and serious uptime savings.

Ideal for pre-2010 engines without emission systems and trusted across industries from mining to municipal transit.

Key Features:

• DIMONYL® Anti-Wear Additive
  Proprietary compound reduces friction under load—protecting cams, bearings & valve trains in high-stress environments.
• Solvent-Refined Base Oils (High VI)
  Cleaner burn, lower volatility, and extreme temperature stability from 100% paraffinic base stock.
• Extended Drain Intervals (Up to 100,000 Miles)
  Manufacturer-approved for long oil life. Fewer oil changes = less downtime and lower maintenance costs.
• Optimized for Soot & EGR Engines
  Outperforms industry standards in emissions-heavy, high-soot environments like diesel trucks and generators.
• Cold Start & All-Season Viscosity
  Available in 5W-30, 10W-30, 15W-40, and 20W-50. Flows fast in cold, protects strong in heat.
• High-Zinc Formula
  Engineered for older engines and flat tappet cams. Ideal for classic cars, air-cooled engines, and off-road use.

Applications:

• Classic & Vintage Vehicles (European)
• Over-the-Road Fleets & Transit Vehicles
• Construction, Mining & Off-Road Equipment
• Stationary Engines: Pumps, Generators, Compressors
• Industrial Machinery & OEM Diesel Engines
  

Performance Ratings & OEM Approvals:

• API CI-4 / SM / SL
• Cummins CES 20076–20078, M11
• CAT ECF-1 / 1P / 1K / 1M-PC
• Mack EO-M Plus, T-8 to T-9
• Detroit Diesel 7SE270
• ACEA E3 / E5 | MIL-PRF-2104G
• Daimler-Benz 228.1 / 228.3
• Volvo VDS-2 / VDS-3 | Ford ESE-M2C153E
• Allison C-4 | Global DHD-1
• CCMC G4, G5, D4, D5, PD-2

Vehicle Compatibility

• BMW (1967–1981):
  1600, 1602, 1800, 1802, 2000, 2002, 2000tii, 2002tii, 2500, 2800, 3.0CS, 3.0CSi, 3.0CSL, Bavaria, E12 5-Series, 530i
• Mercedes-Benz (1955–1989):
  190, 190D, 190SL, 200, 220, 220S, 220SE, 230, 230SL, 240, 250, 250C, 250SE, 250SL, 280, 280C, 280S, 280SE, 280SL, 280SEL, 300SEL, 350SL, 450SL, 450SLC, 450SE, 450SEL (Gas only)
• Porsche (1956–1995):
  356 (A, B, C, SC), 911 (L, S, T, E, SC, Carrera), 912, 912E, 914, 924, 924 Turbo, 924S, 944, 968, 930 Turbo
• Volkswagen (1950–1984):
  Beetle, Super Beetle, Karmann Ghia, Fastback, Squareback, Thing, Type 2 Transporter, Campmobile, Kombi, Rabbit Mk1, Scirocco Mk1

Available Viscosities:

• 5W-30
• 10W-30
• 15W-40
• 20W-50

Drain Interval Advisory:

• For heavy-duty equipment, SWEPCO recommends continuous engine oil analysis and timely filter changes to safely reach extended drain intervals of up to 100,000 miles or 600 hours.
• For passenger vehicles, follow your OEM’s recommended oil change schedule—just know SWEPCO 306 offers superior engine protection compared to conventional oils. That means fewer issues, better performance, and long-term savings for your vehicle or fleet.

READY FOR 100,000 MILES OF CONFIDENCE — ORDER SWEPCO 306 NOW