Something To Ponder...

[Jelly]

It's been mentioned on here that the HDEO 15w40's are good down to about 15F.

At 15°F, Delvac 1300 Super comes in at 3,755 cSt!

 

[Al]

quote:

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Originally posted by Jelly:
It's been mentioned on here that the HDEO 15w40's are good down to about 15F.

At 15°F, Delvac 1300 Super comes in at 3,755 cSt!

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Well 15W should be good for -15C or 5F..3500cP

[ January 26, 2005, 08:25 AM: Message edited by: Al ]

 

[Pablo]

And Amsoil 15w40 is 3367 cP @ -20°C/-4°F (ASTM D 2602).......

 

[427Z06]

FWIW

Pennzoil High Milage 10w40 is a derived 3452 cSt @ 9F

Speced at -13F

cP = cSt x g/mL

Using above number 3452 x. 87 = 3003 cP

Thumb rule: cP doubles every 5C drop for dinos, although, things get pretty unpredictable in this temperature region.

 

[JonS]

Chevron straight 30 is 3033 Cst at 15f. A straight weight 30 is better than a 15w40 at 15f?

 

[427Z06]

quote:

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Originally posted by 427Z06:
Thumb rule: cP doubles every 5C drop for dinos

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I guess I should qualify that statement a bit. API Group I and II base oils have been shown to roughly double in CCS viscosity for every 5°C reduction in temperature. Those containing higher VI oils, such as API Group III and IV, increase viscosity by a factor of ~1.7 for every 5°C drop in temperature.

So in short, that doubling factor roughly applies to the CCS in the appropriate temperature region.

 

[haley10]

4,000 @ -20 per my old data sheet for 1300S.

Pretty decent for a dino HDEO.

 

[Dr. T]

Jelly, the actual number doesn't really matter as long as it's within cranking specs. My manual states that a 15w is good down to -20C. I used M-1 15-50 last year down to -22C..the coldest it got in Toronto.

 

[Jelly]

quote:

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Originally posted by Dr. T:
Jelly, the actual number doesn't really matter as long as it's within cranking specs.

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I just found it very interesting that we argue over a few cSt one way or another on the top-end (212F) yet rarely if ever looks at that same oils viscosity when exposed to cold temperatures...turning into a gelatinous blob when your engine demands (requests) fluid lubrication can't be a good thing...

 

[427Z06]

Interesting discussion, Jelly. It was worth a ponder. Unfortunately, your subject matter got accidently highjacked by another thread.