Oil for a REAL winter, 5w30, gm 3.8

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An infrequent hit of -20 F isn't too bad. It's not like we get -40 from the first day of winter to the last day, either, and we can have some nice winter weather. But, we can be hit with a very nasty and prolonged cold spell on occasion. And, one had best be ready for it. If a stretch of -35 to -40 weather hits, and one doesn't have a semi-sensible oil, and a reasonable battery, or some other nice-to-have accommodations to compensate for other issues, one can be in serious trouble, with tow truck waits being 24 hours or more and taxi waits being two or more hours.

So, when -40 does hit, I prefer not to be licorice-sticking a distributor shaft or having a battery give up the ghost for good.
 
Originally Posted By: SavagePatch
Originally Posted By: SavagePatch
Originally Posted By: Darkfire
An alternative to M1 AFE 0w-30 would be Pennzoil Platinum High Mileage 5w-30:

MRV Viscosity 9,900
Pour Point -51 C
10.1 cst @ 100 C
And a nice 170 VI

http://www.pennzoil.com/en_us/products/f...c-Motor-Oil.pdf




Mobil 1 AFE 0w30 has a MRV >13,000. So with PPHM 5w30 having a MRV of 9,900 it's the better choice for cold starts, right?


Just realized that the MRV ratings were for different temps:

M1 AFE 0w30 is at 40°C and PPHM is at 35°C.


Yes, the MRV and CCS limits are what sets the W designation. MRV and CCS also roughly double/halve for every 5C change in temperature. So your PPHM example would be around 20,000cP at -40C. This means it would still be within the limits for the 0W-xx designation so my guess is that its CCS crests the limit at or before -35C, as the CCS limit is much lower.
 
the behaviour isn't linear up to the pour point for oils dependant on PPD. at some point the viscozsity will rise sharply. PAO and POE are more linear though.

What's the pour point of the PPHM?
 
Originally Posted By: Jetronic
the behaviour isn't linear up to the pour point for oils dependant on PPD. at some point the viscozsity will rise sharply. PAO and POE are more linear though.

What's the pour point of the PPHM?


Another good point. At some point the viscosity rise is dramatic, what you see for CCS and MRV are before this point. Since MRV is measured 5C lower than CCS and it is usually, from what I've seen, CCS that would be the one that gets pushed over the limit, looking at pour point should give you an idea of how close to this point MRV is. That is, if your oil has a MRV of 30,000cP at -35C and a pour point of -40C, one could safely assume that the oil's cold temperature performance is not due to the use of PAO base stocks, as the pour point would be much lower. This would indicate that this oil's cold temperature performance starts to take a real dive below -35C.
 
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