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Oil Type for 5.7 ?-gctid370644

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    Oil Type for 5.7 ?-gctid370644

    Hi all, Well I am ready to service my Mercruiser 5.7 V8 engines and were intending to use Castrol Magnatec 10W-40, but have since been told that I should be using the GTX 15W-40, here I was thinking that it was better to use the more expensive superior product. I checked out the Magnatec for Zinc which it has to help reduce wear and not being a full synthetic, thought that it would be the bees knees, Can anyone advise which way I should go ?

    #2
    Whats posted on the engine ?
    Be good, be happy, for tomorrow is promised to no man !

    1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

    '86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !

    Manalapan N.J

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      #3
      Sorry not sure what you mean, Do you mean in the service manual ?

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        #4
        I use mercury Quicksilver 25W40 in my VP (GM) 5.7
        Tony, Cape Cod, MA
        Vice Commodore Bourne Yacht Club
        1994 Carver 390 Cockpit Motor Yacht
        454 Merc Cruisers inboards
        "HOLODECK"
        2014 10' hard bottomed Dink powered by 3.3HP Mariner 2 stroke
        www.bourneyachtclub.com

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          #5
          tonyiiiafl wrote:
          I use mercury Quicksilver 25W40 in my VP (GM) 5.7
          Hey thanks.

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            #6
            I too use the standard Mercury Quicksilver oil.

            It's designed for use in the Merc engine. I see no reason to not use it.
            Jim McNeely
            New Hope a 2004 Bayliner 305 Sunbridge Express Cruiser
            Twin 5.7s with Bravo2 drives
            Brighton, Michigan USA
            MMSI # 367393410

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              #7
              Can anyone advise which way I should go ?
              Shell Rotella 15w30. It's the oil that is most commonly used in commercial marine applications from ships to oil rigs. Inexpensive, and clearly works for heavily-used marine engines.

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                #8
                I'm a fan of Rotella, but some of the GM marine engines need thicker oil. Especially the older ones. I"ve tried to troll with a V-8 using thinner oil and the oil pressure was too low. I picked up a lot of clattering in the drive train.

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