Question about Skil 7 1/4" Magnesium "Mag 77" Wormdrive Saw With Twist Lock Model # SHD77M 72

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Does my Skil #77 gear drive saw require only Skil oil, or is it okay to use synthetic (automotive) 75W-90 GL5 hypoid gear oil, such as Mobil 1?

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  • mjwillis401 Jun 05, 2010

    Thanks for the advice. I also searched through a great number of pages on Google and found a professional carpenter who said that after extended constant use, his model 77 would begin to smoke when hypoid gear oil was in it. He went back to Skil oil and the saw never smoked again. Based on that, I will continue to use Skil oil in my saw.

  • mjwillis401 Jun 06, 2010

    Thank you for the further clarification. No, he didn't mention the source of the smoke - but the discussion was about oil, and the saw continued to work normally, and it no longer smoked when he switched back to Skil oil - so I can only assume it was not electrical. I may never get my saw that hot, though I have gotten it pretty warm when ripping several lengths of rough (full dimension) 2x12 redwood.

  • mjwillis401 Jun 06, 2010

    Thank you for the further clarification. No, he didn't mention the source of the smoke - but the discussion was about oil, and the saw continued to work normally, and it no longer smoked when he switched back to Skil oil - so I can only assume it was not electrical. I may never get my saw that hot, though I have gotten it pretty warm when ripping several lengths of rough (full dimension) 2x12 redwood.

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Hi MJ,

Either is fine.

The concern is not mixing them.

It should be one or the other, not both.

Best regards,

Mike

Posted on May 26, 2010

  • Justin Case
    Justin Case Jun 06, 2010

    Hello again MJ,

    Interesting tidbit. Did he mention if the source of the smoke (electrical vs hot oil)?

    Unlike the differential in a vehicle where the gearing is meant to function at a relatively slow speed, the gear drive in your saw is quite high.

    Mixing synthetic and standard in a high speed environment will result in an emulsification of air and the oils. Like whipping cream.

    The trapped air lessens both the lubricating and heat dissipating attributes of the oil. With extended use the the device will
    become hotter faster and retain that heat longer when both oils are present than with just one or the other.

    I have seen 'Whipped' oil in high performance engines (not water and oil, but air and oil) as a result of the mixing of the two types.

    As I said, interesting.

    Mike


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