Lucas Oil 15W-40 Magnum High TBN CI-4 Heavy-Duty Motor Oil, 1 Gallon — Extended Drain, High-Temperature Protection

Lucas Oil 10076 SAE 15W-40 Magnum High TBN CI-4 is a heavy-duty motor oil engineered to extend drain intervals and protect older, high-soot engines while delivering reliable lubrication under severe conditions.

This Magnum 15W-40 formulation from Lucas Oil is built for demanding work—diesel or gasoline—where soot loading, heat, and extended service life are concerns. Its High TBN (Total Base Number) chemistry and robust detergent package keep contaminants suspended, preserve oil film strength at high temperatures, and reduce the frequency of oil changes compared with conventional 15W-40s. The result is cleaner running internals, reduced oil consumption, and continued pressure where engines and hydrostatic transmissions face tough duty cycles.

How does this oil help in high-soot diesel engines?

High soot volumes from older or heavily loaded diesel engines can thicken oil and accelerate wear. Lucas Magnum sustains soot in suspension rather than allowing deposits to form, maintaining viscosity and film strength for longer. That helps protect bearings, rings, and camshafts in prolonged service intervals.

• High detergent system holds up to twice the contamination in suspension.
• High TBN neutralizes acids produced by fuel combustion.
• Reduced soot-related sludge and varnish formation.

Will this oil perform under high temperatures and heavy loads?

This formulation resists thermal breakdown and retains lubricity when engines run hot or under sustained load. Its additives help prevent oil thinning and film rupture, supporting consistent oil pressure and component protection during hard operation.

• High temperature stability prevents oil breakdown in overheating events.
• Enhanced lubricity reduces metal-to-metal wear under load.
• Maintains oil pressure for reliable lubrication at high RPMs and loads.

Can I use it in both gasoline and diesel applications, including transmissions?

Yes—Lucas Magnum 15W-40 is suitable for many gasoline and diesel engines and is also compatible with hydrostatic transmissions that can accept engine oils. Its formulation supports broader equipment use where a durable, high-TBN 15W-40 is acceptable.

• Recommended where manufacturers allow CI-4 or comparable 15W-40 oils.
• Works well in older engines with larger bearing clearances and higher blow-by.
• Compatible with some hydrostatic transmissions requiring robust engine oils.

How does this oil affect maintenance intervals and operating cost?

Because the oil tolerates greater contamination and resists chemical breakdown, it supports extended drain intervals compared with plain 15W-40 oils. Less frequent fluid changes and lower oil consumption can reduce downtime and cost of ownership for fleet and owner-operator equipment.

• Formulated for longer drain intervals under recommended monitoring.
• Lower oil consumption helps maintain oil levels between services.
• Cleaner internals reduce maintenance needs related to deposits.

Who is this for? Lucas Oil 10076 SAE 15W-40 Magnum High TBN CI-4 is aimed at owners and operators of older or heavily loaded diesel and gasoline engines, fleet managers, agricultural and construction equipment users, and anyone needing a tough, long-lasting 15W-40 that tolerates higher soot and heat. It is particularly fitting where extended drains, improved soot handling, and sustained oil pressure are priorities; always confirm compatibility with your engine or transmission manufacturer’s specifications before use.