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Penzoil vs. Mercruiser Oil for Outboard?

Discussion in 'Ask All Sailors' started by catalanc, Jan 11, 2017. Add this thread to a FAQ

  1. catalanc

    catalanc

    Joined Mar 23, 2015
    122 posts, 20 likes
    Catalina 22 MK-II
    US Dillon, CO
    I am changing the oil in my Yamaha 4 HP outboard. I have a bottle of Penzoil 10-30W oil in hand but the local marine dealer recommends the Mercruiser brand. Is there any real difference?
    Thanks,
    cec
     


  2. Justin_NSA

    Justin_NSA

    Joined Jul 7, 2004
    4,053 posts, 452 likes
    Hunter 30T
    US Cheney, KS
    Probably because that is what he sells. Oil is oil. Just use the correct weight and rating.
     


  3. justsomeguy

    justsomeguy

    Joined Feb 20, 2011
    5,781 posts, 590 likes
    MacGregor, Island Packet 35
    US Tucson, AZ/San Carlos, MX
    Except price? No.
    Flame on, you brand-specific puritans! :biggrin:
     


  4. Gene Neill

    Gene Neill

    Joined Sep 30, 2013
    2,044 posts, 523 likes
    C-22, Albin Vega
    US central Florida
    I agree with both the above.
     


  5. Rick Webb

    Rick Webb

    Joined Jun 2, 2004
    2,558 posts, 37 likes
    Hunter 23.5
    US Fort Walton Yacht Club, Florida
    There is a difference in the marine stuff vs automobile. Doubt there is significant difference between brands.

    Anecdotally, a guy I knew who has a "Master" marine technician who's family owned a Mercury dealership and a marina grew literally up in the shop told me he always looked at the oil containers in the boat when they came in for work and never saw a blown motor with the marine Quicksilver, Yamalube, or whatever marine oil there were always automotive oil containers.

    Walmart sells the Merc stuff and for as little as the small outboards use I've gone with the marine stuff.
     


  6. jeepbluetj

    jeepbluetj

    Joined Jan 18, 2016
    377 posts, 91 likes
    Catalina 30
    US SoCal Dana Point
    What would the difference be? Different additives? There must be a way to find out with actual data rather than anecdote if/what the real difference is.

     


  7. Rick Webb

    Rick Webb

    Joined Jun 2, 2004
    2,558 posts, 37 likes
    Hunter 23.5
    US Fort Walton Yacht Club, Florida
    Yes the additives as a boat motor typically runs cooler than a car and in a wet environment so there are additional corrosion inhibitors, other stuff too I don't remember now. I was going to switch to a full synthetic for our four coach boats in the youth sailing program at our club but after doing some research I decided to stick with the marine stuff. If I remember right I spoke with several sources and even to a guy with Mobile 1 and he suggested to stay with the marine stuff.
     


  8. Henry Scurlock

    Henry Scurlock

    Joined Feb 27, 2004
    126 posts, 13 likes
    SunTracker 18 DLX PartyBarge
    US Hoover Reservoir - Columbus OH


  9. catalanc

    catalanc

    Joined Mar 23, 2015
    122 posts, 20 likes
    Catalina 22 MK-II
    US Dillon, CO
    Thanks to all for the comments. Sounds like a variety of opinions and I think the last post indicating that a FC-W rating is recommended cinched it for me. I actually don't know how old the bottle of Penzoil is and it does not have a FC-4 rating, so I will go with the Mercruiser brand for now. Better safe than sorry, especially since the engine does not take much oil!
     


    Henry Scurlock likes this.
  10. Justin_NSA

    Justin_NSA

    Joined Jul 7, 2004
    4,053 posts, 452 likes
    Hunter 30T
    US Cheney, KS
    That's how to look at it. Viscosity and rating are what matter. For the little that is needed, if Mercruiser gives piece of mind it's worth it.
     



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