HEAVY-DUTY DIESEL OIL COMPARISON — OEM APPROVALS, WEAR DATA & EXTENDED DRAIN
HEAD-TO-HEAD: OEM APPROVALS
| Feature | AMSOIL DME (Sig. Series Max-Duty) | Mobil Delvac 1 ESP 15W-40 |
|---|---|---|
| API | CK-4 | CK-4 |
| Viscosity | 15W-40 | 15W-40 |
| CES 20086 (Cummins) | ✓ Yes | ✓ Yes |
| DFS 93K222 (Detroit GHG17) | ✓ Yes | ✓ Yes |
| VDS-4.5 (Volvo) | ✓ Yes | ✓ Yes |
| EOS-4.5 (Mack) | ✓ Yes | ✓ Yes |
| MB 228.51 | ✓ Yes | ✓ Yes |
| Caterpillar ECF-3 | Not listed | ✓ Yes |
| Allison TES-295 | No (ADP does) | Not listed |
| Extended drain program | ✓ Yes — documented | Not published equivalently |
| Availability | Dealer network / online | Widely available retail |
| Price point | Premium | Premium |
WHERE THE DIFFERENCE SHOWS
Both products have strong OEM approval lists for North American Class 8 applications. The gap narrows compared to Rotella T6 — Delvac 1 ESP is a serious product that belongs on any shortlist.
The differentiator for AMSOIL is the extended drain program: documented 50,000+ mile intervals with oil analysis support. Mobil does not publish an equivalent program. For TCO-focused fleets tracking cost-per-mile, extended drain intervals are where the math works in AMSOIL’s favor.
Caterpillar ECF-3 is listed for Delvac 1 ESP but not for DME — relevant for mixed fleets running Cat-powered equipment alongside Class 8 trucks.
WHERE DELVAC 1 FITS
Mobil Delvac 1 is available at truck stops and fleet accounts across North America. For operators who need to source oil on the road or through standard fleet purchasing channels, Delvac 1 is accessible where AMSOIL may not be. That’s a real operational consideration for over-the-road fleets that can’t always plan their oil changes.
For fleets with a home terminal and controlled drain intervals, sourcing AMSOIL through a dealer is not a barrier. For drivers who pull into a Flying J and need oil, Delvac 1 is the practical choice on the road.
AMSOIL DME — PRODUCT DETAILS
AMSOIL Signature Series Max-Duty 15W-40 (DME)
Full synthetic. CK-4. VDS-4.5, EOS-4.5, CES 20086, DFS 93K222, MB 228.51 approved. AMSOIL’s top-tier diesel oil with documented extended drain capability up to 50,000 miles with oil analysis.