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Oil change

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  • Oil change

    Hi Guy's , I'm sorry to say that this season i won't be able to get much more than 30hrs. on my boat. That being said I would like opinions on weather I should have to change the engine oil with so few hrs. before putting it to bed for the winter.
    Thanks

  • #2
    yes, change oil

    your changing it because the byproducts of combustion turns the oil acidic which eats bearings.
    1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - http://forums.iboats.com/forum/owner...988-rogue-2420

    Past Boats
    1970 Wooster Hellion - Merc 9.8
    2002 SeaRay 190BR - 5.0 - A1G2 - "Cheasheads in Paradise"
    1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

    What’s behind you doesn’t matter.Enzo Ferrari

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    • #3
      You could probably get away with it, but why chance it, recommend changing
      94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
      95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
      07 SeaDoo GTX
      Raw Water Pump Maintenance
      Merc Adults Only
      G-Dad always said "First Liar doesn't stand a chance"

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      • #4
        30 hours is plenty enough hours to require an oil change.
        1998 Wellcraft Eclipse 24 Cuddy
        Volvo Penta Duo-Prop 7.4L "LK"

        2006 Sun Tracker Party Barge 21
        Mercury 90 4-Stroke FI
        "Common sense is not very common"
        "Failing to prepare is preparing to fail." -- John Wooden

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        • #5
          Thanks Guy's, I usually do but wanted another opinion.

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          • #6
            Drain a little of your drive oil too. Look for water intrusion!

            Oil changes for both the engine and drive on a yearly basis are not all that costly....
            1987 FourWinns 211 Liberator, Originally an OMC 460 King Cobra.
            Re-powered in 2006 with a 1997 Mercruiser 7.4L Bravo III

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            • #7
              30 hours x55 mph= 1650 miles in your car. So a boat motor running at higher rpm's, and working harder than a car motor needs a bit more preventive maintenance. Yup, change it.
              If ya can't fix it with a hammer,ya got yourself an electrical problem.

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              • #8
                If you really want to know, take an oil sample and send it in. I've done 2 on my v6 at around 50 hours, and the oil came back very good, no point in changing it yet.

                Comment


                • #9
                  Originally posted by smokingcrater View Post
                  If you really want to know, take an oil sample and send it in. I've done 2 on my v6 at around 50 hours, and the oil came back very good, no point in changing it yet.
                  2 tests are cheaper than an oil change?
                  1987 FourWinns 211 Liberator, Originally an OMC 460 King Cobra.
                  Re-powered in 2006 with a 1997 Mercruiser 7.4L Bravo III

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                  • #10
                    Originally posted by HT32BSX115 View Post
                    2 tests are cheaper than an oil change?
                    Nope, never said they were cheaper either :-) 2 tests can tell you a trend that can save you later though. I usually run 2 seasons on oil now, have for quite a few years. (and of course, tests tell you far more about your engine and how it is running/wearing.)

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                    • #11
                      Originally posted by smokingcrater View Post

                      Nope, never said they were cheaper either :-) 2 tests can tell you a trend that can save you later though
                      In what way is it going to save you later...especially with a raw water cooled boat where you aren't worried about antifreeze in the oil?

                      I can somewhat see the value in an engine in a truck or auto but doing them on boats kinda doesn't make sense to me especially if you are a person who puts so little hours on an engine that you are skipping seasons to change the oil.
                      1998 Wellcraft Eclipse 24 Cuddy
                      Volvo Penta Duo-Prop 7.4L "LK"

                      2006 Sun Tracker Party Barge 21
                      Mercury 90 4-Stroke FI
                      "Common sense is not very common"
                      "Failing to prepare is preparing to fail." -- John Wooden

                      Comment


                      • #12
                        Originally posted by bruceb58 View Post
                        In what way is it going to save you later...especially with a raw water cooled boat where you aren't worried about antifreeze in the oil?

                        I can somewhat see the value in an engine in a truck or auto but doing them on boats kinda doesn't make sense to me especially if you are a person who puts so little hours on an engine that you are skipping seasons to change the oil.
                        Just a believer in doing preventative maintenance when it is needed, and not doing it when it isn't. (also, I have access to free/cheap oil tests!)

                        2 consistent tests told me that the oil had a lot of life left in it, wear metals were good, and it was within grade. That is the same as changing your car's oil at 3000 miles but yet the manual says 6000+. You are just flushing money based on myths and wivetales, not science. (lots of people still do exactly that for vehicles, for the sole reason that is how their dad, and their dad's dad did it. Not one bit of it based on science (aka oil testing)

                        One other thing to consider... You might be doing damage in the startup after your oil change, unless you pre-fill your filter AND run the starter with the ignition disabled until you get oil pressure. (which very, very few people do.) I have a lot of experience in a specific high performance car environment, and there was a very distinct trend of people losing bearings under 200 miles after an oil change.
                        Last edited by smokingcrater; August 1st, 2017, 04:10 PM.

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                        • #13
                          I pre fill my filter before I start my engine but the it's a myth that you need to crank your engine without the ignition on to build pressure first. There is plenty of oil on all the surfaces after an oil change to not cause damage. Oil pressure develops within a few seconds if you watch your oil pressure gauge. I also don't change my oil at 3K miles either.

                          I take it you do the same when your engine sits for over 6 months in the winter? That would be when you want to do that...not right after an oil change.

                          I still want you to tell me how these oil tests are going to save me later with a boat. What preventative maintenance would I really expect to do if the oil test came back with high metal levels?

                          5 qts of Mobil 1 at Walmart cost less than a $28 oil test with Blackstone.

                          Last edited by bruceb58; August 1st, 2017, 04:47 PM.
                          1998 Wellcraft Eclipse 24 Cuddy
                          Volvo Penta Duo-Prop 7.4L "LK"

                          2006 Sun Tracker Party Barge 21
                          Mercury 90 4-Stroke FI
                          "Common sense is not very common"
                          "Failing to prepare is preparing to fail." -- John Wooden

                          Comment


                          • #14
                            Even airplane engine manufacturers say you don't need to preoil an engine after an oil change.
                            https://www.lycoming.com/sites/defau...al%20Start.pdf
                            1998 Wellcraft Eclipse 24 Cuddy
                            Volvo Penta Duo-Prop 7.4L "LK"

                            2006 Sun Tracker Party Barge 21
                            Mercury 90 4-Stroke FI
                            "Common sense is not very common"
                            "Failing to prepare is preparing to fail." -- John Wooden

                            Comment


                            • #15
                              Sign up today
                              Deleted
                              If ya can't fix it with a hammer,ya got yourself an electrical problem.

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