Going into 2026, proper lubrication isn’t just maintenance — it’s mission-critical. That’s why Boss Truck Shops is rolling out our new Conventional Oil Package: Boss Oil 15W40 — designed specifically for heavy-duty diesel applications where reliability and protection matter most.
Why 15W40 Still Matters
15W40 remains one of the most trusted oil grades for diesel engines — balancing flow at startup (the 15W cold rating) with protection and stability under load (40 weight at operating temperature). Whether you’re idling in cold weather or grinding through highway miles, the right oil keeps heat down and wear minimized.
Boss Oil: What Sets It Apart
· Engine Protection: Designed to help reduce wear in critical areas like bearings, cam lobes, and piston rings.
· Thermal Stability: Stands up to high operating temperatures — helping trucks run cooler and longer.
· Deposit Control: Helps minimize sludge and varnish build-up for cleaner internal components.
· Designed for Diesel Workloads: Suited to heavy loads, long hauls, and the stop-and-go demands of everyday duty.
Who It’s For
· Fleets focused on uptime
· Owner-operators who demand reliability
· Trucks with older engines that benefit from robust conventional oil performance
· Anyone balancing value and protection in routine maintenance
When to Use Boss Oil 15W40
· During standard oil changes
· Before seasonal temperature swings
· After heavy loads or long hauls
· Anytime you need dependable lubrication and engine confidence
At Boss Truck Shop, we believe the right oil isn’t just about mileage — it’s about longevity and resilience. With our Conventional Oil Package 15W40, you get a proven oil formula backed by expert service and support.
Ask your service advisor about Boss Oil 15W40 on your next visit — and keep your engine running strong mile after mile.
With you, to haul and back™.
