• If this is your first visit to the iboats.com Boating Forums, be sure to check out the FAQ. To post a question or comment, begin by signing up. To start viewing messages, select the forum that you want to visit from the selection below.


Announcement

Announcement Module
Collapse

Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Below are some additional forum policies in hopes of all iboats members will follow, Thank you.

1. Please do not reply to old topics or hijack existing topics. Old topics of a technical nature are like a library book, Please do not write in them.

2. Old topics should be considered archives and used for reference only. Please do not reply to them.

3. Do not take over someone elseís topic (aka hijack) with your own question, even if it is similar. If you have a question that has not been covered to your satisfaction in the archives, it is always best to start a new topic of your own.

4. If you have a question for the original poster (OP) and the topic is over 30 days old, send the OP a PM, he may not even visit the forums any longer, or may not notice your question in the old topic.

5. By starting your own topic, you will receive the maximum number of views by forum helpers that may not even notice your question when itís posted at the end of someone elseís topic. And those answers will be specific to your particular issue.

6. Please do not post to topics that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any topic that remains inactive for that long should be considered "dead". It is especially confusing when there is an entirely new question posted to an old topic.

7. Posting at the end of any topic is considered to be hijacking the original posters topic which in turn subjects the topic to be closed if it continues to happen thus not making it fair to the original poster in the future had for some reason he/she needed to return for additional information or provide an update of the problem solved which is always welcomed within a reasonable amount of time frame.

8. Please note that you should see a red banner pop up near the bottom of each inactive topic asking you not to reply to old topics. The Red banner will read: Please note this topic has been inactive for 90 days. For the best results, please start a new topic.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
http://forums.iboats.com/forum-rules-guidelines-405/
See more
See less

Best oil 4 40 hp merc 4 stroke?

Page Title Module
Move Remove Collapse
X
Conversation Detail Module
Collapse
  • Filter
  • Time
  • Show
Clear All
new posts


  • Best oil 4 40 hp merc 4 stroke?

    Not to start the old oil debate but . . .

    For the purist's out here (which I am one) I have only used the Merc blend in in the Quick Silver gallon jug.
    I figured I'd give my O/B a mid season treat last week and changed the oil. I only had a little left of the Merc blend so I used a jug of 10w-30 Pensoil I had in the garage.

    Now that I look at the almost empty Merc jug it says 25w-40 for Sterndrive and inboard motors.

    A check of my manual calls for their Merc 25w-40 synthetic blend. The jug I had is not synthetic.
    The manual also says if you prefer to not use synthetic, Then the Merc 10w-30 blend os OK or another good quality approved 10w-30 oil (which is what I used)

    Anyone think after 5 years I could switch to using a synthetic blend Merc or other 25w-40 synthetic and also change the filter at the same time too so as not to mix oils.

    I usually change the 3 plugs oil, filter and lower unit oil at the start of the season.

    Should I just stay with a good quality 10-30 and would changing to synthetic be overkill and something Merc would love to see everyone buying their synthetic oil only from them!

    I clock about 200 hours a season over maybe 6-7 months.
    2007 Lund 1425 Classic SS
    2007 40 hp Merc 4 stroke EFI ELPT

    http://s198.photobucket.com/albums/a.../Boat/?start=0

    http://s198.photobucket.com/albums/a...-8-08/?start=0


  • #2
    Re: Best oil 4 40 hp merc 4 stroke?

    Most 4 cycle marine engines recommend FC-W oil. I would stick with that. Automotive oil is not usually FC-W, and therefore not recommended. I do not think the synthetic vs non-synthetic is the proper question.

    Comment



    • #3
      Re: Best oil 4 40 hp merc 4 stroke?

      Originally posted by Chris1956 View Post
      Most 4 cycle marine engines recommend FC-W oil. I would stick with that. Automotive oil is not usually FC-W, and therefore not recommended. I do not think the synthetic vs non-synthetic is the proper question.
      The jug I used was actually Quaker State 10w-30.

      The specs on the Mercury jug are: Premium SAE 25W-40 blended with special high grade oils and formulated without viscosity improvers, giving a premium quality multi-viscosity 4-cycle motor oil. Suitable for use in gasoline or diesel sterndrive and inboard engines. Meets API service SJ, CF-2, CH-4. SAE 25W-40 1-gallon / 3.785L

      Notice it does not say 4 stroke outboards though? I'll pick up some Marine Grade as you suggest.

      But one of my original questions was "my merc manual" says use 25w-40 synthetic. I avoided the synthetics when O/B was new as a gal is like $62 against the Merc 10w-30 for around $30 a gal. as Merc's 2nd recomendation.

      Could you expand on why you say syntehtics is not the proper question???

      I was under the impression that once you run regular oil in an engine you should not switch to a synthetic . . . is this why you said that?

      Thanks for your input.
      2007 Lund 1425 Classic SS
      2007 40 hp Merc 4 stroke EFI ELPT

      http://s198.photobucket.com/albums/a.../Boat/?start=0

      http://s198.photobucket.com/albums/a...-8-08/?start=0

      Comment



      • #4
        Re: Best oil 4 40 hp merc 4 stroke?

        No, What I meant was that you should run FC-W oil. I think it less important if it is synthetic or non-synthetic. Is that QS oil FC-W? I will bet the Mercury oil is....

        Comment



        • #5
          Re: Best oil 4 40 hp merc 4 stroke?

          The QS oil has no lettering to that effect. It's bottled for Walmart as I see their name on the oil. Need to get that stuff out. Who knows, probably recycled stuff. Thx for that response.
          2007 Lund 1425 Classic SS
          2007 40 hp Merc 4 stroke EFI ELPT

          http://s198.photobucket.com/albums/a.../Boat/?start=0

          http://s198.photobucket.com/albums/a...-8-08/?start=0

          Comment



          • #6
            Re: Best oil 4 40 hp merc 4 stroke?

            I have a 2006 75 hp merc 4 stroke. I use Quicksilver 25w40. That is what the dealers mechanic told me to use. It is also on the sticker by the oil fill. I plan on keeping this outboard 'forever' and since I just change the oil once a year the extra cost is worth it if only for piece of mind.
            "The true soldier fights not because he hates what is in front of him,but because he loves what is behind him."
            G. K. Chesterson.

            Lowe FM165 with 75 hp Mercury 4 stroke

            Comment



            • #7
              Re: Best oil 4 40 hp merc 4 stroke?

              Update: thanks Catfish. I actually ordered a gal of the Mercury Quicksilver 10w-30. The last gal I had before I ran out was Mercury Quicksilver formulated for inboards and out drives! I doubt that there is a difference between quicksilver inboard or the outboard formulation anyway, but when I ran out I had used some Quaker State automotive 10w-30 that had Walmart on the label too. It's probably recycled stuff and it's for automotive use anyway. From what I've read Marine grade oil has additives to reduce moisture so I wanted to get that stuff out of there anyway and use what Chris poster above and my Merc manual recommended anyway. At least this Mercury Quicksilver 10w-30 is formulated for 4 Stroke "outboard" performance.

              Gotta love the web. Several days ago I had no desire to start driving around from store to store to find a gallon. I knew West or a marina would be like $30 and I bought the wrong oil from West them the last time. No point in driving to a Walmart as they are usually out of stock by this time of year. Their boating aisle is probably Xmas decorations by now

              So I searched online and it was not easy as most sites were $30 plus shipping. Some even had $12 shipping Hahaha. But I finally found a boating store online for $19.99 with free shipping. Amazing, 3 days later today it was sitting on my doorstep. Funny thing though, still has no markings as to FC-W on the bottle anywhere. They probably get away with that by just saying specially engineered for 4 stroke marine use!

              Going out to change the filter and oil right now. I'll save the other stuff I put in two weeks ago to top off my cars.

              I know oil discussions threads can start a war and any good grade marine oil (as the manual says) will suffice. But from my experience, keeping track of each service in those blank pages in the manual, noting what brands you used for each service and keeping all receipts . . . I keep my toys pristine. When I go to upgrade and the buyer looks at the care and maintenance my item has had. Usually, the first buyer grabs it and I usually get a premium price which pays for the extra cost of using name brand products along with peace of mind while I had the use of the item.

              Thanks for all the above responses.
              2007 Lund 1425 Classic SS
              2007 40 hp Merc 4 stroke EFI ELPT

              http://s198.photobucket.com/albums/a.../Boat/?start=0

              http://s198.photobucket.com/albums/a...-8-08/?start=0

              Comment



              • #8
                Re: Best oil 4 40 hp merc 4 stroke?

                I just pick up a quart at a time while i'm at wally world for other stuff. When it's time to change oil I have everything on hand and it doesn't break the bank.
                "The true soldier fights not because he hates what is in front of him,but because he loves what is behind him."
                G. K. Chesterson.

                Lowe FM165 with 75 hp Mercury 4 stroke

                Comment

                Working...
                X