10,000 mile between oil changes

IDZRVIT

Nows your chance - tell us why oil at temperatures of 200-220 F won't go the distance. Provide references also.

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stormcrow

Two words - viscosity breakdown. No references needed.

IDZRVIT

LOL, at 220 F? Are you an accountant?

__________________
"America.... still builds rockets!"
Vette: 355 cid, 400 rwhp
'13 CTS-V Coupe: 6.2L LSA, 556HP

stormcrow

Have you ever bothered to look at an oil temperature viscosity chart? It is weight dependant, of course, but check out 0w40 or 5w40. If you think that it won't break down before 7500 miles at 220 degrees farenheit, then you should quietly excuse yourself from this thread.

ChrisSlicks

I have looked at the chart, and the viscosity at 220 degrees is well within operating range. The lower viscosity does not cause breakdown in within itself.

stormcrow

The debate is not whether or not 220 is within operating range, but whether or not it will be sufficient for protection after 7500 miles. The answer is no.

And you are correct, lower viscosity does not equate breakdown...but, with rising temperature viscosity drops and metal-to-metal contact begins. Engine wear is greatly accelerated. Viscosity breakdown begins when temperatures exceed the viscosity's rating.

ChrisSlicks

I'm not really arguing the point of 7,500 miles, personally I wouldn't go that long unless I was driving all highway and running synthetic.

But as far as viscosity goes, as I understand it you have to get the oil pretty thin before shear comes into play. I stand by 220 being an ideal operating temperature and viscosity for 5W30 and 5W40 oil. I'm happy to be proven wrong by any oil experts out there.

370Zsteve

Quote:
Originally Posted by stormcrow
Two words - viscosity breakdown. No references needed.


No, he's a douchebag.

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ChrisSlicks

As I understand it 200-220 is the ideal operating temperature. If you spend a lot of time well above that then I would consider that harsh.

stormcrow

Actually, the rule of thumb is 10 degrees cooler than your coolant temperature is the optimum operating temperature. so, 200 is right on the cusp. I would say 180-190 would be optimum. Of course, below 180 is not really recommended.