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Oils

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kffischer

04-24-2001 09:44:38




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noticing people suggessting multi-grade oils for use in tractors...whenever we've run multi-grade in warm weather (50F+) and worked our tractors, any color, the oil boils over. the only thing that stands up to real work is straight 30W didn't matter if the tractor was worn, or fairly new/overhauled. anything less than 30 under load boils out.
for the show tractor multigrade is good enough.




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JCB

04-25-2001 04:55:30




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 Re: oils in reply to kffischer, 04-24-2001 09:44:38  
What do you mean "boils out"? Boils out of where? - For oil to boil, it would have to be at least 212 degrees (The boiling point of water.) The whole reason for multi-weight oils is their ability to resist breaking down when heated. Multi-weights are not really multiple or different weights of oil, but rather the first number is the true viscosity of the oil and the second number is it's ability to resist heat, like a oil of that viscosity. ie. a 15W/40W is a 15W viscosity, with the ability to withstand heat like a 40W. When the first multi-weights came out, there were some problems with them, but they have come a long way in the last fifty years. To sum it up, todays multi-weight oils are far superior to any straight weight oil.

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kffischer

04-25-2001 06:12:23




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 Re: Re: oils in reply to JCB, 04-25-2001 04:55:30  
well it has to go somewhere. half hour after a fill and low oil pressure, and the sump is almost dry and steaming...put in 30w there's oil there for weeks under the same operating conditions. operators manual for one machine says do not use multigrade because it will not hold up.
have also seen it physically coming out the breather tube on another tractor.



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Jack

05-01-2001 17:53:53




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 Re: Re: Re: oils in reply to kffischer, 04-25-2001 06:12:23  
The owner's manual for my Suburban with 6.2 diesel recommends only using straight 30 weight under summertime conditions. I have seen other diesel engines where straight 30 weight was recommended for high temperature conditions. There is a petroleum engineer that discusses this issue in detail on the internet forum for GM 6.2-6.5 diesel truck engines. (www.62-65-dieselpage.com) I get lower oil consumption in my diesel engines when I use straight 30W under high temperature conditions.

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