Flashpoint not meaningful?

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1,723
Location
Virginia
Now I could be mistaken, but I think what they're trying to say is that the flash point alone, once above a certain point, doesn't indicate that one is a better performing lubricant then another. So one oil with a flash point of 216ºC and another oil with a flash point of 227ºC, does not automatically indicate that the second oil is a better overall lubricant. I can only assume they made that comment b/c the Mobil Clean 5000 conventional oils have a flash points listed at 200ºC, while competing conventional oils are closer to 220º
 
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11,185
Location
Bad Axe, MI
 Originally Posted By: sicko
Now I could be mistaken, but I think what they're trying to say is that the flash point alone, once above a certain point, doesn't indicate that one is a better performing lubricant then another. So one oil with a flash point of 216ºC and another oil with a flash point of 227ºC, does not automatically indicate that the second oil is a better overall lubricant. I can only assume they made that comment b/c the Mobil Clean 5000 conventional oils have a flash points listed at 200ºC, while competing conventional oils are closer to 220º
IF thats the case,,true.
 
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1,340
Location
minneapolis mn
Could one say that in the event of something really bad happening, eg my daughter is driving home and the car blows a radiator hose and gets very hot before she notices. Is this an example of where a higher flash point would be helpful?
 
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11,185
Location
Bad Axe, MI
 Originally Posted By: duaneb9729
Could one say that in the event of something really bad happening, eg my daughter is driving home and the car blows a radiator hose and gets very hot before she notices. Is this an example of where a higher flash point would be helpful?
That and a synthetic would help yes i would say.
 
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18,449
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East of IGO
 Originally Posted By: duaneb9729
Could one say that in the event of something really bad happening, eg my daughter is driving home and the car blows a radiator hose and gets very hot before she notices. Is this an example of where a higher flash point would be helpful?
No, the engine would be damaged before the oil would make a difference most of the heat in an engine is in the combustion area cyl heads and top of the block so the oil is seperated from that heat by the empty water jacket. Yes there will be more heat but again damage will occur before oil will make a difference.
 
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19,479
Location
Chicago Area
The greatest heat an engine oil sees is on the top piston ring/land area. It is directly exposed to combustion and high temps. A higher flashpoint is always more desirable.
 
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8,711
Location
Nothern USA
The oil seldom catches fire or evaporates. The flashpoint can be lowered by small amounts of a high vapor pressure component perhaps only used as a carrier for an additive. Even assuming the flashpoint relates to the molecular weight of the base oil, a straight 30 weight should be higher than a 10W-30 and a 5w-30 lower than it. Does that mean a straight 30 weight is the best, and the 5W-30 the worst?
 
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18,449
Location
East of IGO
 Originally Posted By: mechtech2
The greatest heat an engine oil sees is on the top piston ring/land area. It is directly exposed to combustion and high temps. A higher flashpoint is always more desirable.
I have seen a whole lot of mitsubishi engines at work overheated from coolant loss from cracks between the intake and exhaust valves and coolant loss . The engines were run untill the valve seats fell out of the heads causing the engine to run bad enough fot the driver to notice there was a problem, that is pretty hot. A new or repaired cyl head was installed and the engines were put back to work ,this was on conventional oil.
 
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13,132
Location
By Detroit
NOACK volatility is much more useful than flash point in evaluating an oil. BTW, Several years ago I drove 8 miles on the freeway after my radiator hose blew on a 30 degree day. There does not appear to have been any damage to the engine (cast iron block and heads). I was running Redline 5w20 at the time. Don't know the numbers but Redline would have to have an excellent NOACK and flash point.
 
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