Skip to Main Content
Close Icon

Main Menu

Begin typing to search, use arrow keys to navigate, Enter to select.
Your order may take longer than normal to arrive, and some products may be unavailable. We are working hard to overcome supply-chain issues and freight-carrier delays. Learn more.

SAE 15W-40 Heavy-Duty Diesel and Marine Oil

Product code : AMEQT-EA

Recommended for applications specifying API CI-4+ and prior specifications
Controls soot and wear
Reduces oil consumption and emissions
Delivers maximum engine protection over extended drain intervals
Provides outstanding protection and performance in temperature extremes
Try Signature Series Max-Duty 15W-40 for a serious upgrade

Recommended for applications specifying API CI-4+ and prior specifications
Controls soot and wear
Reduces oil consumption and emissions
Delivers maximum engine protection over extended drain intervals
Provides outstanding protection and performance in temperature extremes
Try Signature Series Max-Duty 15W-40 for a serious upgrade

SAE 15W-40 Heavy-Duty Diesel and Marine Oil



Premium diesel oil providing excellent performance in diesel engines where highly effective control of wear and deposits is vital. Built with heavy-duty dispersant/detergent additives with 12 TBN, Synthetic Heavy-Duty Diesel & Marine Oil neutralizes acids and controls soot thickening from EGR and blow-by to protect against corrosion, cylinder bore polishing (wear) and varnish/sludge deposits. It resists heat and breakdown and is formulated for extended drain intervals.

See the product data sheet for full details.

CONTROLS SOOT AND WEAR

  • Neutralizes acids and controls soot thickening to protect against corrosion, wear, varnish and sludge deposits
  • Reduces oil consumption and emissions
  • Delivers maximum engine protection over extended drain intervals

EXCELS IN EXTREME TEMPERATURES

  • Provides outstanding protection and performance in temperature extremes
  • Resists heat and breakdown better than conventional oils
  • Eases cold-weather starting and provides vital startup lubrication

 

See the product data sheet for full details.

SAE 15W-40 Heavy-Duty Diesel and Marine Oil



SAE 15W-40 Heavy-Duty Diesel and Marine Oil

  • 4 star rating
    Liked it way better before the prices went sky high
    By  HERB,  a  Verified Buyer  from  Orlando,fl  on  May 17, 2022
    Failed to verify captcha
    It use to cost me about the same for 3 gallon oil change as I paid for a five quart one, not so nowadays
    Was this review helpful?
  • 5 star rating
    the only oil for my boat
    By  JOHN,  a  Verified Buyer  from  sunshine coast, BC  on  May 15, 2022
    Failed to verify captcha
    just had the valve cover off my Cummins Marine 5.9. pristine at 1000 hours. Amsoil products are the only oils in all my power equipment.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    1977 Ford 1600 tractor
    By  PAUL,  a  Verified Buyer  from  clinton, oh  on  April 25, 2022
    Failed to verify captcha
    So far so good Time will tell
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great oil for my 2006 DMAX LBZ
    By  RUSS,  a  Verified Buyer  from  South Louisiana   on  April 18, 2022
    Failed to verify captcha
    Been using this oil since first oil change.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    BEST OIL FOR MY CUMMINS 8.9 DIESEL PUSHER EVER
    By  DAREDEVILLEGEND,  a  Verified Buyer  from  TAMPA BAY AREA, FLORIDA  on  April 17, 2022
    Failed to verify captcha
    The AMSOIL for my diesel is AMAZING. I would never use anything else. Thank You for such a GREAT Product :-) God Bless Bob
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Diesel engine oil
    By  R.G.,  a  Verified Buyer  on  March 20, 2022
    Failed to verify captcha
    Love many different Amsoil products. Diesel engine oil works great in my Tractor
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    A Great Synthetic Oil
    By  SHERMAN,  a  Verified Buyer  on  February 16, 2022
    Failed to verify captcha
    I've been using Amsoil Synthetic Oil for many years and my diesel engines just keeps lasting.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great Oil
    By  GEORGE,  a  Verified Buyer  from  NC  on  January 06, 2022
    Failed to verify captcha
    AMSOIL products are always reliable and ship quickly. Packaging is durable and clean. They've even sent me free bottles of firearm cleaner in which worked so well I purchased them on top of my usual oil orders.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Diesels' best friend
    By  Kent,  a  Verified Buyer  from  OR  on  December 24, 2021
    Failed to verify captcha
    Always use this in every diesel rig. Some now as old as 25 yrs. Never an oil problem. On the road at all times and never down due to oil. Don't use this at your own peril. Peace of mind is crucial.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great product
    By  KENNETH,  a  Verified Buyer  from  Maryville tn.  on  November 06, 2021
    Failed to verify captcha
    Love this product great price to. Going to switch all my vehicles over to amzoil.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?