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can I put diesel oil in my engine ?

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  • can I put diesel oil in my engine ?

    good day,

    1980 Mercruiser MCM 898 (305) V8 s/n 5452697
    I was told yesterday by a mecanic tech that I can put 15w40 diesel oil in my engine because it's old and diesel oil will better lubricate the engine. He recommended SHELL diesel oil.
    Does it make any sense ?

    Louis


  • #2
    Re: can I put diesel oil in my engine ?

    Ayuh,..... You can if you want too.....

    Diesel oils are basically the same oils, with a higher detergent package.....

    It comes down to my signature,.... Just change the word Grease to Oil......
    Any Grease is Better,..... Than No Grease at All.......

    Comment



    • #3
      Re: can I put diesel oil in my engine ?

      theres been quite a few oil threads here on the fourm. use the search function to find a lot of info and opinions.... my opinion is i don't know which oil to use for being the best. however i feel that mercuriser probably knows what they think is best for mercruisers..... so, since i have a mercruiser, even though it is old like yours.... i use mercruiser oil... 25W-40.....
      'Lime Time'
      1975 AristoCraft Nineteen
      Mercruiser 165hp (chevy 250 L6), MC-1 drive

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      • #4
        Re: can I put diesel oil in my engine ?

        I run Shell Rotella with no problems. I think it has a higher zinc? content which helps with the lifters vs todays newer roller lifters which dont need it
        90 Chaparral 2150SX 350 MAG Alpha 1
        Vortec Heads, LT4 HotCam Upgrade
        GM BowTie 1.6 Roller Rockers
        Edelbrock RPM Air-Gap Intake
        Edelbrock 600CFM Marine Carb * New MPH* 65.2
        Laser II 21 Prop 5400 RPM's Corsa Exhaust

        Comment



        • #5
          Re: can I put diesel oil in my engine ?

          if your in canada you may want something with a lower base stock. Maybe 10-30 or 10-40.
          I have and old boat and i run straight 30HD. And i make sure i let it warm up every time before I take it out.

          Nothing wrong with running an oil in the 40 and even 50 weights. as long as its not 0 degrees when you start it, and as long as you make sure it warms up first.
          just because you found it that way does not mean it is supposed to be that way.

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          • #6
            Re: can I put diesel oil in my engine ?

            [....
            Last edited by whywhyzed; May 24th, 2008, 05:17 PM.

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            • #7
              Re: can I put diesel oil in my engine ?

              Diesel oil is rated for both C and S engines, which means it is suitable for compression and spark ignition engines (gas and diesel). It basically comes down to the correct viscosity. 15W40 sounds good. Try it and see how it works.

              Have a great day,

              Rob.

              Comment



              • #8
                Re: can I put diesel oil in my engine ?

                No problem, I use it in my 350..

                Comment



                • #9
                  Re: can I put diesel oil in my engine ?

                  Hey!!! another oil thread!!!! We never have those......



                  Yeah you can use it (I use Shell Rotella 15W40 in mine)


                  (Although C & S have never meant compression and spark....it's a rough equivalence )



                  Just change it once a year...preferably right after your last run of the season.......your engine will never know the difference!





                  Originally posted by Robj View Post
                  Diesel oil is rated for both C and S engines, which means it is suitable for compression and spark ignition engines (gas and diesel). It basically comes down to the correct viscosity. 15W40 sounds good. Try it and see how it works.

                  Have a great day,

                  Rob.
                  ----------------------------------------------------------------------------------
                  I use xxx oil and have never had a problem........
                  This post was created with OpenSuSE x64 Linux!

                  Comment



                  • #10
                    Re: can I put diesel oil in my engine ?

                    WELL

                    Auto oils have had the ZDDP level reduced to meet current EPA requirments


                    "Most" true diesel oils should still there full dose of ZDDP (which is a good thing )


                    Flat tappet cams like the ZDDP


                    Tommays
                    If a dirty bottom slows you down what do think it does to your BOAT

                    1970 Cal 29 Sea Fever
                    http://cal29seafever.blogspot.com/
                    1981 J24 Tangent 2930
                    http://s565.photobucket.com/albums/s...%20for%20sale/
                    Tommays
                    Northport Ny

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                    • #11
                      Re: can I put diesel oil in my engine ?

                      thanks for your replies and help.
                      I change engine oil one a year, I will try the Shell Rotella 15w40 this time.
                      I appreciate.
                      Louis

                      Comment



                      • #12
                        Re: can I put diesel oil in my engine ?

                        Here's the straight skinny on API Oil ratings. I was taught Compression and Spark as well, but it is Service and Commercial . . . I was also taught that when two ratings are given, such as CJ-4/SM, then the first one was the intended rating and the second was met based on the composition kinda by accident. Anyway, the chart explains it all . . .
                        Torque gets you there. Horsepower gets you there in time for dinner.

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                        • #13
                          Re: can I put diesel oil in my engine ?

                          If I would have put commercial and service, most people would not know what I am talking about.........including myself. Spark and Compression is how I remember the difference.

                          Have a great day,

                          Rob.

                          Comment



                          • #14
                            Re: can I put diesel oil in my engine ?

                            Oh...gawd! This thread ought'a be good for at least 100 posts!!!


                            Yes ZDDP (and diesel oils) is good for flat tappet engines....I'm also using it in my old Ford Y-block!

                            Unfortunately ZDDP coming out of all the oils, even the diesel oils, since it interferes with the cat converters and the after treatment systems in the newest diesels.

                            I haven't had a close look at the latest NMMA FC-W oil make up but I would be willing to bet that it will be the last oil to have a suitable level of ZDDP until marine (4-stroke) engines are forced to use cat converters (2 years maybe?)

                            Most new marine engines are probably not going to have problems since most are "roller-follower" engines anyway...

                            We'll all probably have to switch to Aeroshell 15W50 to continue to get the high levels of zddp or start using some snake oil additive sold at high price over the counter! (illegal in California of course!!)

                            The EPA is really beginning pizz me off!!!








                            Originally posted by tommays View Post
                            WELL

                            Auto oils have had the ZDDP level reduced to meet current EPA requirments


                            "Most" true diesel oils should still there full dose of ZDDP (which is a good thing )


                            Flat tappet cams like the ZDDP


                            Tommays
                            ----------------------------------------------------------------------------------
                            I use xxx oil and have never had a problem........
                            This post was created with OpenSuSE x64 Linux!

                            Comment



                            • #15
                              Sign up today
                              Re: can I put diesel oil in my engine ?

                              If you have a roller cam then you can run whatever you want. I was running Shell Rotella with the factory flat tappet. Now I am going to 5w 30 since I have installed the LT4 roller cam.

                              I have been hearing rumors that the ZDDP additive is on its way out of the Shell oil as well. My dad keeps tabs on it because of his Cuda.

                              Comp cams makes a cam break in additive that you can run with regular oil that has lower levels of ZDDP.
                              -1990 Glastron 5.0 Alpha 1
                              -Vortec Truck Roller Cam conversion

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