The first in synthetics

Unmatched Diesel Engine Lubrication Excellence

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Helps maximize equipment life

Excels in Temperature Extremes

Advanced synthetic-blend diesel oil with greater than 50% synthetic content. Meets or exceeds original equipment manufacturer requirements in both on- and off-road applications.

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Formulated for Long Engine Life

Commercial-Grade Diesel Oil

15W-40 DIESEL OIL

2.5 Gallon Jug

FREE Shipping on orders of two or more. Preferred Customer save 25% today!

15W-40 DIESEL OIL

55 Gallon Drum

FREE Shipping – Retail Account for Oil Change Service Garage

15W-40 DIESEL OIL

275 Gallon Tote

Free Shipping and discounts for Commercial Customers

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The first in synthetics

Why Choose Us?

HEAVY-DUTY ENGINE PROTECTION from the 1st in synthetics | Amsoil

VISCOSITY CONTROL

Keeps soot particles suspended independently, helping prevent formation of larger, wear-causing particles

EXCELS IN EXTREME TEMPERATURES

Formulated to deliver improved heat and oxidation resistance compared to other synthetic-blend and conventional diesel oils

HEAVY-DUTY ENGINE PROTECTION

•    Delivers 2X more wear protection
•    Helps maximize equipment life
•    Helps reduce maintenance costs and downtime

Customer Testimonials

I’ve been using AMSOIL 15W-40 exclusively in my Westerbeke genset and Cummins 6BT5.9 for 18 years now. At every fluid change the analysis from Blackstone comes back with excellent results. AMSOIL is my engine fluids supplier…period!

Bottom Line:
 Yes, I would recommend this to a friend.

– KEVIN,  a  Verified Buyer  from  Us East Coast   on  March 03, 2024

Works good for not being a full synthetic. I like it because the burnout rate is a lot less.

– By  CHIP,  a  Verified Buyer  from  Missouri   on  January 13, 2024

I would highly recommend any amsoil product due to their superior quality and service. They offer great quality products and at a very reasonable price

–  LORIN,  a  Verified Buyer  from  High Torque Garage wallkill ny  on  November 29, 2023

COMMERCIAL GRADE DIESEL OIL

AMSOIL 15W-40 DIESEL OIL

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