Mack Engines — MP7 · MP8 · MP10
Mack Engine Oil — MP7, MP8 & MP10 Spec, Capacity & Intervals
Mack's MP-series diesel engines are the 11-litre MP7, the 13-litre MP8 and the 16-litre MP10. All three use Mack's own oil spec on top of API: EOS-4.5 (CK-4 based) and, on 2021 and newer engines, EOS-5.0 (FA-4 based). Most Mack oil guides get the capacities and drain intervals wrong. This page gives Mack's own numbers for each engine and links to the full guide for yours.
Last reviewed: October 2026 · Based on Mack service literature (Body Builder manual, Service at a Glance) and AMSOIL data sheet G3467
Every Mack MP7, MP8 and MP10 can run oil meeting Mack EOS-4.5 (API CK-4), usually 15W-40. On 2021 and newer Mack engines, Mack recommends EOS-5.0 (API FA-4) and keeps EOS-4.5 as the minimum; EOS-5.0 oil does not go in 2020-and-older engines. The MP7 and MP8 take 44 quarts; the MP10 takes 55 quarts with the standard pan. Mack's interval on EOS-4.5 oil runs up to 55,000 mi (44-qt pan) or 60,000 mi (55-qt pan) in normal duty. Red Seal tech pick for every Mack MP engine: AMSOIL Max-Duty 15W-40 (DME).
Oil & Filter
Standard Pan
Every MP Engine
OEM Interval
Mack Engine Oil by Engine
Mack's three MP engines share one oil spec but not one pan size. The MP7 and MP8 take 44 quarts; the MP10 takes 55 quarts with the standard pan, and the bigger pan earns the MP10 an extra 5,000 miles in every duty class.
| Engine | Size | Oil Capacity | Mack Spec | Normal-Duty Interval |
|---|---|---|---|---|
| MP7 | 11L inline-6 | 44 qt (42 L) | EOS-4.5 · EOS-5.0 on 2021+ | 55,000 mi |
| MP8 | 13L inline-6 | 44 qt (42 L) | EOS-4.5 · EOS-5.0 on 2021+ | 55,000 mi |
| MP10 | 16L inline-6 | 55 qt (52 L) | EOS-4.5 · EOS-5.0 on 2021+ | 60,000 mi |
Mack Oil Spec by Model Year — EOS-4.5 vs EOS-5.0
Mack splits its oil spec at the 2021 model year. 2020-and-older MP engines use Mack EOS-4.5, a CK-4-based spec. On 2021 and newer Mack engines, Mack recommends EOS-5.0, an FA-4-based spec, and still accepts EOS-4.5 as the minimum. EOS-5.0 oil is for 2021 and newer engines only.
- Mack SpecEOS-4.5
- API CategoryCK-4
- Primary Viscosity15W-40
- Cold Climate5W-40
- EOS-5.0 / FA-4 Allowed?No — EOS-4.5 only
- AMSOIL ProductDME 15W-40 / DEO 5W-40
- Mack RecommendsEOS-5.0 (FA-4)
- Mack MinimumEOS-4.5 (CK-4)
- EOS-4.5 Acceptable?Yes — Mack's minimum
- Why EOS-5.0Fuel economy
- Why EOS-4.5One oil for mixed model years
- AMSOIL ProductDME 15W-40
Simple rule: EOS-4.5 works in every MP7, MP8 and MP10. EOS-5.0 only goes in 2021 and newer. Check your operator's manual and the model year on the engine data plate. AMSOIL's heavy-duty diesel oils are CK-4 oils that meet Mack EOS-4.5; AMSOIL does not currently offer an EOS-5.0 oil.
⚠ Two oils to watch for. EOS-5.0 oil is not backward compatible: in a 2020-or-older Mack, its lower viscosity can drop oil pressure and trigger warnings. And keep AMSOIL AME (Heavy-Duty Diesel & Marine) out of on-highway Macks: it is a CI-4+ oil for engines without exhaust aftertreatment, and every on-highway MP engine runs a DPF and SCR.
Mack Oil Change Intervals — MP7, MP8 & MP10
Mack sets the oil and filter interval by pan size and duty, on EOS-4.5 oil: normal duty is over 6 mpg, heavy duty over 5 mpg, severe duty under 5 mpg. Mack-branded oil adds 5,000 mi to each. If idle time is over 30%, use the next shorter interval.
| Duty | Fuel Economy | 44-qt Pan (MP7, MP8) | 55-qt Pan (MP10) |
|---|---|---|---|
| Normal | Over 6 mpg | 55,000 mi (89,000 km) | 60,000 mi (97,000 km) |
| Heavy | Over 5 mpg | 40,000 mi (64,000 km) | 45,000 mi (72,000 km) |
| Severe | Under 5 mpg | 30,000 mi (48,000 km) | 35,000 mi (56,000 km) |
Intervals shown are for EOS-4.5 oils other than Mack's own, including AMSOIL. An MP10 built with the optional 44-quart pan uses the 44-quart intervals.
⚠ Going past Mack's interval? Do it on oil analysis. A good synthetic gives you more margin inside Mack's interval. Going beyond it safely takes a lab report on your own truck, because heavy loads, idle time, biodiesel blends, EGR cooler leaks and soot loading all shorten oil life.
How Much Oil to Buy for a Mack Service
A 44-quart MP7 or MP8 service is exactly 11 US gallons: two AMSOIL Twin Packs plus one gallon jug. A 55-quart MP10 service is 13.75 gallons: three Twin Packs, with 5 quarts left for top-offs.
| Engine | Per Service | Jugs | Per 55-gal Drum | Per 275-gal Tote |
|---|---|---|---|---|
| MP7 / MP8 | 11 gal (44 qt) | 2 Twin Packs + 1 gallon | 5 services | 25 services |
| MP10 | 13.75 gal (55 qt) | 3 Twin Packs | 4 services | 20 services |
⚠ Always verify capacity with your engine's service label and dipstick. Overfilling causes oil foaming, aeration, and seal damage. Underfilling reduces oil pressure margin under high load.
Best AMSOIL Oil for Mack Engines
For every Mack MP7, MP8 and MP10, the Red Seal tech pick is AMSOIL Signature Series Max-Duty 15W-40 (DME), a CK-4 oil formulated to meet Mack EOS-4.5. Max-Duty 5W-40 (DEO) is the cold-climate pick, and Max-Duty 5W-30 (DHD) covers mixed fleets that need one oil for every make.
- Formulated to meet Mack EOS-4.5
- Also meets Volvo VDS-4.5 for D11, D13 and D16
- 6X more wear protection than Detroit's DD13 scuffing test requires
- Strong hot-temperature film protection (HTHS 4.5)
- Formulated to meet Mack EOS-4.5
- Cold cranking to −30°C vs −20°C for 15W-40
- Good choice for Canadian winter routes
- API CK-4, formulated to meet EOS-4.5 (not EOS-5.0)
- Also meets CES 20086, DFS 93K222, VDS-4.5
- Cold cranking to −30°C (−22°F)
Use the AMSOIL heavy-duty lookup to cross-reference your engine make, model, year, and emissions tier.
Use the AMSOIL Heavy-Duty Lookup →AMSOIL Mack Oil — Which Tier Is Right for You?
Not every truck or budget calls for the same product. AMSOIL makes multiple diesel oil tiers depending on the job.
| Product | Protection Level | Drain Interval | Best For |
|---|---|---|---|
| Signature Series Max-DutyDME / DEO / DHD | Top-tier synthetic diesel protection | OEM interval; beyond it with oil analysis | Owner-operators and fleets maximizing uptime |
| Heavy-Duty SyntheticADO / ADP | Full synthetic protection | OEM interval | Operators wanting synthetic protection at lower upfront cost |
| Commercial-GradeSBDT / SBDF | Synthetic-blend upgrade | OEM interval | Fleets upgrading from conventional oil |
All three tiers are API CK-4 oils that meet the requirements of Mack EOS-4.5. Run Mack's interval for your duty cycle, and use oil analysis before going past it.
Why Mack Fleets Should Run Oil Analysis
Every MP engine runs EGR and aftertreatment, and Mack shortens the interval when idle time goes over 30%. Mileage alone does not tell you the full story.
A basic oil analysis sample checks the numbers that matter:
- → TBN: remaining acid-neutralizing reserve
- → Soot: soot loading and viscosity risk
- → Wear metals: iron, copper, chromium, aluminum
- → Coolant contamination: early warning for cooler or gasket problems
Over 30% idle and Mack drops any MP engine to the next shorter interval. Long idle hours load the oil with soot and fuel without adding miles.
Oil analysis shows what idle is actually doing to your oil, truck by truck.
| Analysis kit | A fraction of one oil change |
| Early coolant leak detection | Major repair avoided |
| Confirmed drain extension | Fewer oil changes |
| Wear metal trending | Rebuild risk reduced |
Mack Engine Oil — Common Questions
From owner-operators, fleet managers, and shop techs running Mack MP7, MP8 and MP10 engines across North America.