Home » Public Forums » GMCnet » Re: [GMCnet] GmTrans temp
| Re: [GMCnet] GmTrans temp [message #155421] |
Wed, 04 January 2012 17:16  |
Gary Casey
Messages: 448
Registered: September 2009
Karma:
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Senior Member |
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John,
I think that is something like what happens, but as I recall from a chemistry class far back in the last century, chemical reactions typically double in speed every 7 degrees (F or C, I don't remember). Unlike what you read on the net (yeah, it must be true :-), I think at 220F the oil life is more like 500,000 miles. By the time you get to 300F, though, I think the life might be 1,000 miles or less. And I think it is a very nonlinear function, maybe more severe than you are saying. Let's see, 7C is about 10F, so with my prediction, 230 gets you 250,000 miles, 240 is 125,000, 250 is 62,500, 260 is 31,250, 270 is about 16,000, 280 is 8,000, 290 is good for 4,000, 300 is 2,000 and 310 is 1,000. 320 gives a life of 500 miles. Or something like that. And I think I believe it. Our old rule of thumb was that if you saw over 300 you changed the oil at the next reasonable opportunity.
Gary
Found this on the web so it must be right, right?
As a rule of thumb, every 20 degree increase in operating temperature above 175 degrees F. cuts the life of the fluid in half!
At 195 degrees F., for instance, fluid life is reduced to 50,000 miles. At 220 degrees, which is commonly encountered in many transmissions, the fluid is only good for about 25,000 miles. At 240 degrees F., the fluid won't go much over 10,000 miles. Add another 20 degrees, and life expectancy drops to 5,000 miles. Go to 295 or 300 degrees F., and 1,000 to 1,500 miles is about all you'll get before the transmission burns up.
--
John Lebetski
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