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Pour Point confusion.... #4548678
10/19/17 08:30 PM
10/19/17 08:30 PM
Joined: Mar 2008
Posts: 5,942
Michigan
ZZman Offline OP
ZZman  Offline OP
Joined: Mar 2008
Posts: 5,942
Michigan
I was checking the Pennzoil website and looking at different spec sheets. I noticed that the 5w oils had a lower pour point than the 0w oils. This confuses me.


2003 Mercury Grand Marquis. Rotella T6 Multi-Vehicle oil
2008 Sebring Hardtop convertible. Rotella T6 Multi-Vehicle oil
2006 Kawasaki Vulcan 900 LT. Amsoil Metric 10w-40
Re: Pour Point confusion.... [Re: ZZman] #4548684
10/19/17 08:37 PM
10/19/17 08:37 PM
Joined: Dec 2005
Posts: 9,860
Upper Midwest
kschachn Offline
kschachn  Offline
Joined: Dec 2005
Posts: 9,860
Upper Midwest
Originally Posted By: ZZman
I was checking the Pennzoil website and looking at different spec sheets. I noticed that the 5w oils had a lower pour point than the 0w oils. This confuses me.

It illustrates that pour point is really not indicative of anything that pertains to ICE operation. It definitely does not correlate to the cold-cranking and pumpability specification. That's why the "W" specification exists.


1994 BMW 530i, 228K
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Re: Pour Point confusion.... [Re: ZZman] #4548696
10/19/17 08:51 PM
10/19/17 08:51 PM
Joined: Dec 2002
Posts: 40,825
'Stralia
Shannow Offline
Shannow  Offline
Joined: Dec 2002
Posts: 40,825
'Stralia
when they started classifying oils, the Pour Point was considered representative of engine operation.

W ratings were once based on pour point (and viscosity in Cp), then evolved to "borderline pumping"...these were found to be again, as per kschachn's post not to be representative of how oils behaved in engines.

So relatively recently, MRV (Mini Rotating Viscometer) replaced these measures, as basically how easily the oil "falls" into the oil pump pick-up tube (Dynamic viscosity maximum, and absence of yield stress)...pour point is viscosity independent, it can still be pouring, but not able to be sucked up (think straw and thickshake).

Re: Pour Point confusion.... [Re: ZZman] #4548699
10/19/17 08:54 PM
10/19/17 08:54 PM
Joined: Mar 2008
Posts: 5,942
Michigan
ZZman Offline OP
ZZman  Offline OP
Joined: Mar 2008
Posts: 5,942
Michigan
So higher CCS and MRV are the signs of better pump ability.


2003 Mercury Grand Marquis. Rotella T6 Multi-Vehicle oil
2008 Sebring Hardtop convertible. Rotella T6 Multi-Vehicle oil
2006 Kawasaki Vulcan 900 LT. Amsoil Metric 10w-40
Re: Pour Point confusion.... [Re: ZZman] #4548721
10/19/17 09:14 PM
10/19/17 09:14 PM
Joined: Apr 2008
Posts: 37,091
Ontario, Canada
OVERKILL Offline
OVERKILL  Offline
Joined: Apr 2008
Posts: 37,091
Ontario, Canada
Originally Posted By: ZZman
So higher CCS and MRV are the signs of better pump ability.


Lower (numerically) at a given temperature.


2018 RAM 1500 Big Horn EcoDiesel
2016 Grand Cherokee SRT
Re: Pour Point confusion.... [Re: ZZman] #4549141
10/20/17 10:41 AM
10/20/17 10:41 AM
Joined: Mar 2008
Posts: 5,942
Michigan
ZZman Offline OP
ZZman  Offline OP
Joined: Mar 2008
Posts: 5,942
Michigan
Here are some specs from Pennzoil. Which is really the best in cold weather?
PYB 5-20....CCS 5200/MRV 18000
PP 5-20.... 4000/9000
PP 0-20.... 5650/14100
PP 10-30.... 4150/8500
PPHM 5-20..... 4000/8100
PPHM 0-20..... 5380/17900


2003 Mercury Grand Marquis. Rotella T6 Multi-Vehicle oil
2008 Sebring Hardtop convertible. Rotella T6 Multi-Vehicle oil
2006 Kawasaki Vulcan 900 LT. Amsoil Metric 10w-40
Re: Pour Point confusion.... [Re: ZZman] #4549176
10/20/17 11:27 AM
10/20/17 11:27 AM
Joined: Apr 2008
Posts: 37,091
Ontario, Canada
OVERKILL Offline
OVERKILL  Offline
Joined: Apr 2008
Posts: 37,091
Ontario, Canada
From the above list? the PPHM has the lowest numbers, so it is the best.

Keep in mind, the tests are performed at different temperatures with the 0w-xx designation occurring at -35C for CCS and -40C for MRV. You can take the 0w-xx results and roughly halve them to get the 5w-xx numbers. You can halve them again to get 10w-xx.


2018 RAM 1500 Big Horn EcoDiesel
2016 Grand Cherokee SRT

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