Last I checked the highest HTHS of a 0 weight oil was 3.6. If you want more then that you have to step up to at least 5WX oil or higher.
Why use anything other than a 0wXX oil?
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427Z06 - I reformated a viscosity-temp chart made by zoomzoom (hold him reponsible for accuracy ) for your perusal. Remember that anything outside of the 40C-100C spec should be interpretated carefully. Viscosity in cSt. Temperatures in C. Enjoy.
Great contribution, clears everything up, thanks!
Great contribution, clears everything up, thanks!
Let's remember the "w" grade only defines certain properties at particular temperatures. It doesn't say anything about the viscosity in other temperature regions:
[ January 27, 2005, 07:00 PM: Message edited by: 427Z06 ]
See API Engine Oil Classifications in full.
[ January 27, 2005, 07:00 PM: Message edited by: 427Z06 ]
BlazerLT, HTHS stands for "High Temp. High Shear" it is a measurement that many belive is move telling about an oil then SAE viscosity in terms of engine performance. Try the search feature and HTHS and I am sure you will get the answere you are after!
"More confusion occurs because people think in terms of the oil thinning when it gets hot. They think this thinning with heat is the problem with motor oil. It would be more correct to think that oil thickens when it cools to room temperature and THIS is the problem. In fact this is the problem. "
From "Oil 101" So who is correct?
[ January 27, 2005, 10:44 PM: Message edited by: paker ]
quote:
Originally posted by paker:
"Oil 101" is speaking from the perspective of oil at operating temperature and viscosity. Most of us usually think of oil from the perspective of ambient temperature and viscosity.
So naturally, we think of oil thinning as it gets hot, vs thickening as is cools. Both perspectives are correct...maybe not equally useful.
But you already knew that...you're just stirring the pot!
Tim
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Ack
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Any oil thickens with lower temperatures and thins with higher temperatures.
I reformated a viscosity-temp chart made by zoomzoom (hold him reponsible for accuracy
) for your perusal. Remember that anything outside of the 40C-100C spec should be interpretated carefully. Viscosity in cSt. Temperatures in C. Enjoy.
Originally posted by Blue99:
As we can see, M1 5w30 is a thinner viscosity than GC 0w30 until the temp is well below 0 C.
(Sheesh, I really hate it when I quote myself, kinda like arguing with yourself & loosing!)
Blazer, let's try this again. Here are the viscosities for GC 0w30 and M1 5w30, side-by-side.
At the -20C temperature, GC is about 400 cSt thicker than M1 5w30, but will cross-over somewhere below -20C and get thinner than the M1 5w30.
Make Sense?
As we can see, M1 5w30 is a thinner viscosity than GC 0w30 until the temp is well below 0 C.
(Sheesh, I really hate it when I quote myself, kinda like arguing with yourself & loosing!)
Blazer, let's try this again. Here are the viscosities for GC 0w30 and M1 5w30, side-by-side.
Oil gets thicker as it cools. M1 5w30 (10.0 centistokes) is thinner than GC 0w30 (12.0) at 100C and stays thinner as the temperature drops to -20C (about zero F),the smallest temperature value on this chart.
At the -20C temperature, GC is about 400 cSt thicker than M1 5w30, but will cross-over somewhere below -20C and get thinner than the M1 5w30.
Make Sense?
Those results I deem invalid.
There is NO WAY that 5w30 is thinner than 0w30 at -20.
Also, why don't you post the difference between Mobil 1 0w30 instead of the GC 0w30 for comparison.
I don't know where you got them.
[ January 28, 2005, 03:01 AM: Message edited by: BlazerLT ]
There is NO WAY that 5w30 is thinner than 0w30 at -20.
Also, why don't you post the difference between Mobil 1 0w30 instead of the GC 0w30 for comparison.
I don't know where you got them.
[ January 28, 2005, 03:01 AM: Message edited by: BlazerLT ]
M1 is thinner than GC at -20c(-4 f).You'll really have colder than a witches bosom to get into a range where GC is thinner but by that point you should really have a block heater on
.
GC looked pretty thick at around 9 degrees F compared to M1 5W30 in my crude "slosh the oil around in the bottle"test.M1 was definitly less viscious.
GC looked pretty thick at around 9 degrees F compared to M1 5W30 in my crude "slosh the oil around in the bottle"test.M1 was definitly less viscious.
Patman
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However you slice it, GC 0w30 works very well in the cold. This morning it was only -10F here, and my Corvette was parked outside overnight as it is most nights. It fired up this morning without hesitation, the engine did not sound labored at all when turning over. And it settled into a smooth idle right away.
Here where it seldom gets below 0, 5w30 is working good for me. It also did fine August 03 when we visited Florida. Do I need something with VII?
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