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Proper gear lube for mercruiser 1 drive

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  • Proper gear lube for mercruiser 1 drive

    Hello all, I was looking at some bottles of gear lube I had lying around. One quicksilver bottle has gl-4. And a penzoil lower unit gear lube is a gl-5. Which one do I use for a mercruiser 1 drive. Serial number 4794847. It's a 233 mercruiser engine. I've seen some quicksilver bottles say for less then 75 hp. I haven't seen the ones for more then 75hp. Is there a difference between the two? Thank you.

  • #2
    Quicksilver Premium high performance gear lube...there should be no doubt about this. It's not expensive.
    Hope that helps.

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    • #3
      you can use any 80-85-90W Hypoid, antifoaming, MIL Spec 5, GL-5 rating.
      NO PERSONAL QUESTIONS, THIS IS WHAT THE FORUM IS FOR.

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      • #4
        Originally posted by Bt Doctur View Post
        you can use any 80-85-90W Hypoid, antifoaming, MIL Spec 5, GL-5 rating.
        True statement. I guess I need to keep repeating this, THERE IS NO NMMA MARINE SPECIFICATION FOR HYPOID GEAR LUBRICANT. ZIP ZERO NADA.

        So ANY gear lubricant described above is acceptable (most of US like synthetic [NON-limited-slip] oils, like Mercruiser, Volvo, Mobil 1, Am$oil, Valvoline, Brand-x,y,z)

        Just ENSURE that you fill the drive exactly as the Manufacturer directs in the OEM manual.
        Last edited by HT32BSX115; October 15th, 2017, 12:38 PM.
        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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        • #5
          Thanks for the help. I've only come across the quicksilver fluid rated for less than 75 hp. I however have 233hp. Saw some penzoil gl5. The quicksilver is gl4. Read that the gl5 can corrode brass or white metal ex. Bushings. Any thoughts? Where do you find the quicksilver over 75hp. What's the difference between the hp ratings.

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          • #6
            Originally posted by Odegardc View Post
            Thanks for the help. I've only come across the quicksilver fluid rated for less than 75 hp. I however have 233hp. Saw some penzoil gl5. The quicksilver is gl4. Read that the gl5 can corrode brass or white metal ex. Bushings. Any thoughts? Where do you find the quicksilver over 75hp. What's the difference between the hp ratings.
            Called Quicksilver Premium or high performance gear lube

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            • #7
              Sign up today
              Originally posted by Odegardc View Post
              Read that the gl5 can corrode brass or white metal ex. Bushings.

              It's not as much the GL-5 rating as much as it's certain EP (extreme pressure) additives. that can cause corrosion.
              ASTM actually has a test called the "Copper Strip Corrosion Test" (ASTM D130) I always like to refer to one of my favorite references in lubrication "science" http://machinerylubrication.com/Read...itives-effects

              Certified hypoid lubricants are tested using a whole host of ASTM tests (ASTM D130 being one of them) They usually meet or exceed these test requirements or they don't get certification. You certainly don't want your ("yellow" metal) bushings, synchros and cone clutches corroding in any gearbox!
              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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