Schaeffer's Synshield Durability Advantage 15W40 (10 Quarts)

SynShield Durability Advantage 15W-40 Synthetic Plus Diesel Engine Oil

Protect your diesel engine under demanding operating conditions with SynShield Durability Advantage 15W-40 Engine Oil. This premium synthetic plus heavy-duty diesel oil provides advanced protection against wear, oxidation, soot contamination, sludge buildup, and aeration while supporting long-term engine durability and reliability.

Formulated with proprietary Micron Moly® and Penetro® friction modifiers, SynShield creates a durable protective barrier that reduces metal-to-metal contact on critical engine components, including bearings, pistons, rings, cylinders, and valvetrains. Its advanced formula delivers excellent thermal stability, soot control, and viscosity retention throughout the oil drain interval.

This package contains two 1 gallon and two 1 quart bottles for a total of 10 quarts/2.5 gallons.

Key Features

• Premium synthetic plus 15W-40 heavy-duty diesel engine oil
• Exceeds API CK-4, CJ-4, CI-4, CI-4 Plus, and older service category requirements
• Provides up to 85% less wear than conventional CJ-4 oils
• Delivers 77% greater soot-handling capability than conventional CJ-4 oils
• Micron Moly® and Penetro® friction modifiers reduce metal-to-metal contact
• Excellent thermal and oxidation stability helps prevent sludge, varnish, and deposits
• High shear stability maintains viscosity throughout the oil drain interval
• Low volatility helps control oil consumption
• Resists oil aeration and foaming
• Supports long-term engine durability in extreme-duty applications

Benefits

SynShield Durability Advantage 15W-40 provides enhanced wear protection, improved soot control, and dependable lubrication during high-mileage and heavy-load operation. Its advanced additive technology helps extend component life while maintaining consistent engine protection under extreme conditions.

Applications

• Heavy-duty diesel engines requiring 15W-40 engine oil
• Modern emissions-equipped diesel engines with EGR, DPF, DOC, and SCR systems
• Older diesel engines without EGR systems
• Off-highway and extreme-duty diesel equipment
• High-mileage diesel engines requiring enhanced wear protection

Note: Always verify the engine manufacturer's required oil viscosity and performance specifications before use.

See Technical Data.