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Massey Harris & Massey Ferguson Tractors Discussion Forum

80W90 GL-1 vs. straight 90 GL-1 oils

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sask

06-29-2005 08:35:14

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I haven't been able to find a post that addressed this topic. I was going to put some straight 90 GL-1 mineral oil into my MF65, but then came across the posts mentioning the Shell Dentax, which comes in an 80W90 GL-1. Both are GL-1 so they will be fine, but is the Dentax truly a multi-viscosity oil or is this just a marketing gimic? I would prefer multiviscosity since I live in a colder climate and it would be better for the hydraulics, but I don't feel like paying the premium for the Shell product if it really isn't any different than the cheaper ones labelled as straight 90

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Jefff-oh

06-29-2005 10:06:18

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Re: 80W90 GL-1 vs. straight 90 GL-1 oils in reply to sask, 06-29-2005 08:35:14

I would not worry about it. I have straight 90wt. in my Mf65. Last winter in 15 deg F temps the hydraulics were slow at first but as they warmed up all worked fine.

IMHO
Jeff

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txgrn

06-29-2005 15:38:16

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Re: 80W90 GL-1 vs. straight 90 GL-1 oils in reply to Jefff-oh, 06-29-2005 10:06:18

You ainta gonna know the difference.

Mark

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Ray,IN

06-29-2005 20:47:27

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Re: 80W90 GL-1 vs. straight 90 GL-1 oils in reply to txgrn, 06-29-2005 15:38:16

It is permissible to use 40 wt GL 1 when the temperature is consistently below freezing. You must switch back to the heavier oil in warm weather to prevent premature wear of the system though.

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txgrn

07-01-2005 05:52:49

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Re: 80W90 GL-1 vs. straight 90 GL-1 oils in reply to Ray,IN, 06-29-2005 20:47:27

Don't recall the particulars as it didn't apply to me but I recall seeing in the Ford manuals a dilution method for gear lube in the winter....for those who have no access to 40wt GL-1....which I don't. Course I don't need to as I live in Texas....maybe that's why it's not available.....course what's the difference between that and 40wt non-detergent engine oil?

Mark

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