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Does a 5w conventional start as well at -20f as 5w synthetic? #5344769 02/08/20 04:34 PM
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Whammo Offline OP
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If not, why are the both rated 5w?

Last edited by Whammo; 02/08/20 04:34 PM.
Re: Does a 5w conventional start as well at -20f as 5w synthetic? [Re: Whammo] #5344771 02/08/20 04:41 PM
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Char Baby Offline
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At -20°f yes. I'd say that they're very similar. It's when its even colder e.g. -30°f or-40°f that a synthetic oil would be showing its benefits. Other ways too but you're asking specifically about cold temp starting.

Last edited by Char Baby; 02/08/20 04:43 PM.

Retired 6 yrs now & lovin' it
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'80 Firebird FORMULA V8/4bbl-purchased "NEW"
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Re: Does a 5w conventional start as well at -20f as 5w synthetic? [Re: Char Baby] #5344773 02/08/20 04:46 PM
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Whammo Offline OP
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Originally Posted by Char Baby
At -20°f yes. I'd say that they're very similar. It's when its even colder e.g. -30°f or-40°f that a synthetic oil would be showing its benefits. Other ways too but you're asking specifically about cold temp starting.


Wouldn't you be looking for a 0w for anything colder than -30f anyway?

Re: Does a 5w conventional start as well at -20f as 5w synthetic? [Re: Whammo] #5344775 02/08/20 04:49 PM
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csandste Offline
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Any SN+ 5W would have a big dose of group 3 anyway. Really no 5w conventional left.


2017 Kia Soul Plus-- Valvoline Daily Protection 5w30+ a bit of Harvest King syn 5w30-- 75,000 miles
Re: Does a 5w conventional start as well at -20f as 5w synthetic? [Re: Whammo] #5344777 02/08/20 04:54 PM
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Carbon12 Offline
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Look at some product data sheets. Some brands show their viscosity at -30 C and you can see generally lower viscosity for a synthetic which likely would be easier cranking for the engine.

Re: Does a 5w conventional start as well at -20f as 5w synthetic? [Re: Whammo] #5344778 02/08/20 04:55 PM
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kschachn Offline
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The answer to your question is yes within the range specified for the grade.


1994 BMW 530i, 252K
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Re: Does a 5w conventional start as well at -20f as 5w synthetic? [Re: Whammo] #5344794 02/08/20 05:27 PM
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Char Baby Offline
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Originally Posted by Whammo
Originally Posted by Char Baby
At -20°f yes. I'd say that they're very similar. It's when its even colder e.g. -30°f or-40°f that a synthetic oil would be showing its benefits. Other ways too but you're asking specifically about cold temp starting.


Wouldn't you be looking for a 0w for anything colder than -30f anyway?


Absolutely!
Two vehicles in my sig(Altima/Civic) are using 0W20 oils and we're only getting down into the teens and maybe down to Zero overnight. But, we're using 0W20 for other reasons than just outside temperatures.

Last edited by Char Baby; 02/08/20 05:28 PM.

Retired 6 yrs now & lovin' it
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'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic 1.8 LX
Re: Does a 5w conventional start as well at -20f as 5w synthetic? [Re: Whammo] #5344800 02/08/20 05:40 PM
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OilUzer Offline
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If it's very cold and your battery is weak, I would prefer synthetic of the same grade over dino even if within the W spec.

Re: Does a 5w conventional start as well at -20f as 5w synthetic? [Re: Whammo] #5344816 02/08/20 06:10 PM
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geeman789 Offline
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NO. Mostly ...

The 5w winter rating means that the oil does not exceed a maximum viscosity in two very cold tests. A good synthetic 5w30 will often easily beat the 5w criteria, and almost meet the 0w criteria ( 5*C colder ) .

A conventional 5w30 will sometimes BARELY meet the 5w criteria, and not even come remotely close to meeting the the 0w criteria. Usually the cold temp cranking test is the harder criteria to meet.

[Linked Image]


Using Pennzoil as an example ... the 5w30 PUP is noticeably thinner ( less thick ... ) at extreme cold temps than is the PYB HM. Yet both meet the 5w winter rating criteria. Realistically, if the oil can pump, both will work about the same. But it will take more energy to crank the engine with the thicker oil. And if your battery is only gonna give you one shot at starting, the synthetic will pump easier.

The conventional Pennzoil HM yellow bottle 5w30 is as follows:

[Linked Image]

Pennzoil Platinum Ultra synthetic 5w30 is as shown :

[Linked Image]


2011 SUBARU Impreza 5-door manual / 2016 HONDA Pilot / 2011 MAZDA 2 auto
Re: Does a 5w conventional start as well at -20f as 5w synthetic? [Re: Whammo] #5344976 02/08/20 10:36 PM
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Nice answer, geeman789!


Somewhere between Alaska and Wisconsin...
2006 Silverado LT Crew Cab 4WD & 2013 Equinox AWD
Re: Does a 5w conventional start as well at -20f as 5w synthetic? [Re: Whammo] #5344977 02/08/20 10:37 PM
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SteveG4 Offline
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Full synthetic lubricants and greases are the only way to go in really cold climates (like my Alaska). smile


Somewhere between Alaska and Wisconsin...
2006 Silverado LT Crew Cab 4WD & 2013 Equinox AWD
Re: Does a 5w conventional start as well at -20f as 5w synthetic? [Re: Whammo] #5345009 02/09/20 12:04 AM
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Marco620 Offline
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I believe the synthetic will get up to temperature sooner too. I cant imagine -20 on conventional.Im sure its been done plenty but why?


15' Civic 1.8 i-vtec 311,000 mi M1 0w30 & LG Biotech, BP CVT Fluid,GUMOUT W/ PEA
Doberman Whisperer!
E pluribus unum.

Re: Does a 5w conventional start as well at -20f as 5w synthetic? [Re: Whammo] #5345060 02/09/20 05:15 AM
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Triple_Se7en Offline
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I wouldn't buy conventional for living in extreme weather conditions. Benefits for using synthetics are multiple.


Keepa' Ya' Pistons, Valves & Injectors Clean

19' Hyundai SantaFe 2.4 GDI / 20' Kia Soul XLine 2.0 MPI - both Pennzoil Ultra Platinum 5W30 / Mobil1 Filters
04' Chevy Colorado Castrol 0W40 & Wix



Re: Does a 5w conventional start as well at -20f as 5w synthetic? [Re: Whammo] #5345154 02/09/20 08:49 AM
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CT8 Offline
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The advantage will go to the syn especially when well into the oil change interval.


2015 F150 2.7
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