GotQuestions? Lubricants

Q. Can I use the same engine oil in my gasoline and diesel powered vehicles?

April 28, 2014

SHARING TOOLS        | Print Subscribe

A. Even though many if not most heavy duty engine oils claim both the API C or commercial performance category for diesel and S or service category for gasoline engines, there are two factors two consider. Especially in newer gasoline automotive engines, one factor to consider is the viscosity grades used in diesel engines are generally not correct for modern gasoline automotive engines. Secondly, diesel engine oils typically have additive levels that exceed the gasoline engine chemical compatibility limits that are designed to protect the automotive catalytic convertor. Before electing to use on oil or what has been referred to a universal diesel oil, it is highly recommended that you refer to you owner’s manual as there can be warranty implications in newer vehicles. 

Related Posts


  1. 1. TOM CAPIZZI [ May 05, 2014 @ 10:47AM ]

    I have used Rotella 15w40 engine oil in everything I own for the last 30 years and 30w the previous 16 years. I have no failures or negative experiences to report. My currect vehicle is a 2007 Sierra 1500 WT with 5.3L V8 with 174,000 miles and still gets 21 MPG highway with no engine problems and changed every 7500 miles. I also run 1540 in my 2002 Pontiac GrandAm 2.2L with 120,000 miles still gets 26 MPG with no problems and changed every 5000 miles. Must be me.

  2. 2. Carla [ June 13, 2016 @ 12:50PM ]

    It's kinda 2yrs late since your comment but I want to thank you for sharing "you've used rotella for everything you truck is not diesel and for the past 5 yrs my bf been putting 15 40 rotella I've been so worried. Anyway now I can believe!

  3. 3. Cliff Downing [ September 05, 2016 @ 11:23AM ]

    If one looks at many of the diesel oil jugs, you will see a SL/SM/ or SN rating on top of the CI-4+/CJ-4 ratings. Those SM/SN ratings are for gasoline engines. The newer blends and full syn diesel oils are more than up to the task to us in many gasoline engines. The oil brands do this so that those with mixed fleets can keep their oil stocks to one type and reduce inventory. Myself, I would be a little averse to use using a 15w40 in my gas engines, but I use 10w30 diesel rated oils in many of my gas engine applications. It really has a lot to do with the engine, the climate you are using it in, and what you are using it for. The typical auto/pickup engine probably would be best with a 10w30 year round, and if one was wanting to use a 40w, one of the newer 5w40 diesel oils would be a better idea in colder climates.

  4. 4. mecanicovolf [ December 07, 2016 @ 12:30PM ]

    I'm a golf ? maintenance mechanic and have both gas and diesel fleet. Is Guardiola ETC Diesel Engine Oil With Liquid Titanium SAE 15W-40 alright for gasoline Engines?

  5. 5. Scott Gallup [ June 08, 2017 @ 07:54AM ]

    I'm a Golf Course Superintendent. We have been using Shell Rotella T3 (now t4) 10W-30 in New York in all of our diesel and gas golf equipment, with great results. Zero engine failures since utilizing this oil, and frequently pass 5000 hrs on both diesel and gas engines.

  6. 6. hlanhla [ June 12, 2017 @ 12:37AM ]

    im driving mazda etude gas engine oil its burning a lot of oil, is it wise to try haveay duty oil?

  7. 7. Lehman Carico [ December 15, 2017 @ 07:18AM ]

    Can small diesel engine use the same oil a gasoline engines?

  8. 8. gregory harrison [ February 09, 2018 @ 06:25PM ]

    I use Rotella conventional 15-40W for MB diesel cars since 1975; however, I mixed in 2 Qts of 10-40W Synthetic to 6 Qts conventional. I changed oil every 3500 miles. Got 3,4,5, 600,000 miles ea car. If I use full Synthetic on older 1991 350SD diesel? Small Leaks. 2014 Bluetec Diesel i use full Synthetic and change 10,000 miles but sometimes change 5,000miles cuz I am a T-Rex.

  9. 9. Joseph Neretich [ February 18, 2018 @ 11:25AM ]

    Just a brief question, I used for the first time Shell T1 Heavy duty diesel engine oil in my '85 F250 4.9 gas engine with 150K miles should I be worried?
    Thank you

  10. 10. Igor Abramovich (Mr) [ February 27, 2018 @ 06:03AM ]

    We have Genuine and reliable Supplier of oil and gas products.
    To all those who have real buyers that are ready and willing for the listed product. At the moment seller company have D2, JA1, D6, JP54, spot, FOB Rotterdam, . If you have any interested buyer kindly contact us, hope to here from you soon.


    Igor Abramovich (Mr)
    email: [email protected]
    skype: [email protected]

  11. 11. michael michalski [ February 27, 2018 @ 05:23PM ]

    For newer cars, there may be issues. For example, the higher zinc and phosphorous levels in the CJ rated oils are harder on the emissions systems. For older vehicles, (form the 70s and earlier) with flat tappet cams, the CJ oils are ideal. They NEED that zinc. the CK oils unfortunately will not have the zinc they need. Im not sure what those of us with vehicles will end up doing. We will probably have to go to specialty oils.

  12. 12. Vladislav Yakov [ March 20, 2018 @ 06:00AM ]

    We Can supply Aviation Kerosene,Jet fuel (JP 54-A1,5), Diesel (Gas Oil) and Fuel Oil D2, D6,ETC in FOB/Rotterdam only, serious buyer should contact or if you have serious buyers

    my seller is ready to close this deal fast contact us below:now base email us ([email protected])


    Russia D2 50,000-150,000 Metric Tons FOB Rotterdam Port.

    JP54 5000,000 Barrels per Month FOB Rotterdam.

    JA1 Jet Fuel 10,000,000 Barrels FOB Rotterdam.

    D6 Virgin Fuel Oil 800,000,000 Gallon FOB Rotterdam.

    E-mail: [email protected]
    E: [email protected]
    E: [email protected]

    Best Regards
    (Mr.) Vladislav Yakov
    Skype: neftegazagent

    Thank You

  13. 13. Igor Abramovich [ March 27, 2018 @ 03:14AM ]

    Dear Buyer/buyer mandate
    Confirmed Available FOB Rotterdam for JP54,JA1,D2, D6, with good and workable procedure,whereby buyer will dip test in seller tank.

    Please genuine Buyers and Mandate only

    Kindly Contact us via ( [email protected] ) for SCO.

    Igor Abramovich (Mr)
    email: [email protected]
    skype: [email protected]


Comment On This Story

Comment: (Maximum 2000 characters)  
Leave this field empty:
* Please note that every comment is moderated.

Author Bio

Mark Betner

sponsored by

Heavy Duty Lubricants Manager

Mark Betner boasts 35 years of experience in the lubricants business. As the Heavy Duty Product Manager for CITGO Lubricants he is responsible for initiating and implementing the marketing of new products and human development programs and oversees communications with the media, trade shows and consumer education.

Prior to this, he was a field sales manager and technical training administrator at an independent lubricant company specializing in heavy equipment lubrication.

Mark earned a master’s and bachelor’s degree in both chemistry and biology from Indiana University. He holds a certification from the Society of Tribologists and Lubrication Engineers and is a member of the Truck Maintenance Council.


We offer e-newsletters that deliver targeted news and information for the entire fleet industry.


ELDs and Telematics

sponsored by
sponsor logo

Scott Sutarik from Geotab will answer your questions and challenges

View All

Sleeper Cab Power

Steve Carlson from Xantrex will answer your questions and challenges

View All