I live in Chicago where the summers average 90 degrees (this summer excluded!!) and the winters average 20-30 degrees but can get below zero as well. What would be the best year round synthetic oil weight for my daily driven jeep 4 banger?
Year round Synthetic weights?
- Thread starter wn1998
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Amsoil 5W30 ASL or 10W30 ATM. Mobil 1 Truck and SUV 5w40 or Rotella 5W40. Any of the above are outstanding oils and would work very well in your Jeep.
I'm currently using the 10W30 ATM at 10K OCI's and am liking it very much so far in my Jeep.
I'm currently using the 10W30 ATM at 10K OCI's and am liking it very much so far in my Jeep.
I'm about 100 miles south of Chicago so our weather is very similar, maybe a bit more extreme because of no lake effect.
As far as current synthetics, I've run Mobil 1 5w30 and 10w30, German Castrol 0w30 and Rotella T 5W-40. All of them seem to be acceptable here for year round use...
As far as current synthetics, I've run Mobil 1 5w30 and 10w30, German Castrol 0w30 and Rotella T 5W-40. All of them seem to be acceptable here for year round use...
wn1998,
I use SLX (GC 0W30) year round in an A6 twin turbo and our temps here range from -10 to 90+ and the load on the engine is compounded by hilly terrain ranging from about 6000' to 7500' (I live at about 7000' and I am in a "normal" area of town).
I use SLX (GC 0W30) year round in an A6 twin turbo and our temps here range from -10 to 90+ and the load on the engine is compounded by hilly terrain ranging from about 6000' to 7500' (I live at about 7000' and I am in a "normal" area of town).
I'm going to be using the Syntec 0w30 year round as well now. I live in NE and our weather patterns are very close to yours.
Any quality 0w30 or 5w30 full synthetic oil will do fine (read your manual for the "correct" viscosity).
I have run 5w30 for the past 10 years in my vehicles (maybe 400,000 miles total on 3 vehicles) and have been very satisifed.
Winter starts are good and pleanty of summer protection.
Good luck with your selection.
I have run 5w30 for the past 10 years in my vehicles (maybe 400,000 miles total on 3 vehicles) and have been very satisifed.
Winter starts are good and pleanty of summer protection.
Good luck with your selection.
Unless your at the north or south pole most true synthetics will delight you engine (grp III sham-tec excluded)
Pour Point Data, Source Exxon-Mobil North America
Degrees C, ASTM D97
Mobil 1 SuperSyn 0w30 : -54
Mobil 1 SuperSyn 0w40 : -54
Mobil 1 Truck/SUV 5W40 : -45
Mobil 1 SuperSyn 5w30 : -45
Mobil 1 SuperSyn 10w30 : -45
Mobil 1 SuperSyn 15w50 : -45
So for year round service anywhere in north america I see no argument against even 10W30. 10W30 may have the best advantage for shear stability, and its quite stout for a daily driver.
Of all the M1 grades I look most favorably to the Truck/SUV garde due to its relationship to Delvac 1. This board has made quite a fan of HDEOs
German Castrol 0W30 is also quite favored here.
No data on me, but I am sure the Amsoil gurus can vouch that there oils will have similar excellent cold temp pumpabilities and exemplary TBN reserves.
Pour Point Data, Source Exxon-Mobil North America
Degrees C, ASTM D97
Mobil 1 SuperSyn 0w30 : -54
Mobil 1 SuperSyn 0w40 : -54
Mobil 1 Truck/SUV 5W40 : -45
Mobil 1 SuperSyn 5w30 : -45
Mobil 1 SuperSyn 10w30 : -45
Mobil 1 SuperSyn 15w50 : -45
So for year round service anywhere in north america I see no argument against even 10W30. 10W30 may have the best advantage for shear stability, and its quite stout for a daily driver.
Of all the M1 grades I look most favorably to the Truck/SUV garde due to its relationship to Delvac 1. This board has made quite a fan of HDEOs
German Castrol 0W30 is also quite favored here.
No data on me, but I am sure the Amsoil gurus can vouch that there oils will have similar excellent cold temp pumpabilities and exemplary TBN reserves.
Pour points are somewhat useless. A synth. 15-50 will be thick-a$$ at -25C just as a conventional 15w40. They give some extra margin though before turning into a block of ice....
For year-round use...a 5-40 or 5-50 down to -30C or 0-30/0-40 down to -35C and below...
For year-round use...a 5-40 or 5-50 down to -30C or 0-30/0-40 down to -35C and below...
I think anything would work well enough for me...San Francisco Bay Area. Lowest temp last year was 41(f) and rarely breaks 100.
So...I'll try GC my next oil change.
So...I'll try GC my next oil change.
I'd partially agree, but wonder why:
* AMSOIL published a paper a number of years ago that it didn't really matter if you select a 0W-30, 5w30, or a 10w30? (because the viscosity at 40C was only marginally different).
* do many of the Canadian oil firms sell 10W-40 synthetics for passenger vehicles?
Synthetic PAOs are so different...that comparing them with the conventional oil temperature charts seems misleading.
What was Amsoil referring to?? because the temp. at 40C is useless...it's neither hot nor cold.
No 10-40 synth's here...actually even hard to find 5-40 any more....only BC 5-40.
I disagree...PAO's and dino's on same SAE viscosity chart. They will all be at the same viscosity range per give temp. regardless of base oil type.
No 10-40 synth's here...actually even hard to find 5-40 any more....only BC 5-40.
I disagree...PAO's and dino's on same SAE viscosity chart. They will all be at the same viscosity range per give temp. regardless of base oil type.
1 Here is partial verbage from a Amsoil (Dave Mann) website:
AMSOIL 0w30 is 57.3 cST @ 40 deg. C, & 11.3 cST @ 100 deg. C
AMSOIL 5w30 is 59.5 cST @ 40 deg. C, & 11.7 cST @ 100 deg. C
AMSOIL 10w30 is 66.1 cST @ 40 deg. C, & 11.7 cST @ 100 deg. C.
As you can see from the data above the kinematic viscosities are extremely close. Therefore, whether you use the 0W-30, 5w30 or the 10w30 is strictly a matter of choice. With the small differences in kinematic viscosity you would be hard-pressed to detect these differences on initial engine start-up without specialized engine test equipment.
All three oils are excellent motor oils and ANY one can be used in a vehicle which requires either a 0W-30, 5w30 or 10w30 oil as well as in several other engine applications including an engine which recommends a 5W- 20 oil.
2 Canadian Oil firms - I was speaking of MotrLube which offers a 10W-40 and a 15w40; and I think Irving Oil (which sells in Maine USA) offers a 10W-40 but I'll recant that if its not on their website).
3 My point was the viscosities are the same, but the ability of the oil to flow at low temps is different. Personnally, I'd take a syn PAO 10W-40 over a 5w30 conventional in cold weather.
AMSOIL 0w30 is 57.3 cST @ 40 deg. C, & 11.3 cST @ 100 deg. C
AMSOIL 5w30 is 59.5 cST @ 40 deg. C, & 11.7 cST @ 100 deg. C
AMSOIL 10w30 is 66.1 cST @ 40 deg. C, & 11.7 cST @ 100 deg. C.
As you can see from the data above the kinematic viscosities are extremely close. Therefore, whether you use the 0W-30, 5w30 or the 10w30 is strictly a matter of choice. With the small differences in kinematic viscosity you would be hard-pressed to detect these differences on initial engine start-up without specialized engine test equipment.
All three oils are excellent motor oils and ANY one can be used in a vehicle which requires either a 0W-30, 5w30 or 10w30 oil as well as in several other engine applications including an engine which recommends a 5W- 20 oil.
2 Canadian Oil firms - I was speaking of MotrLube which offers a 10W-40 and a 15w40; and I think Irving Oil (which sells in Maine USA) offers a 10W-40 but I'll recant that if its not on their website).
3 My point was the viscosities are the same, but the ability of the oil to flow at low temps is different. Personnally, I'd take a syn PAO 10W-40 over a 5w30 conventional in cold weather.
Re: Irving Oil, HQ New Brunswick - my bad, their full synthetic is a 5W-40. They do make a gasoline 10W-40 and 20W-50 in dino. Interesting oil company website. I saw Irving Oil gas stations in Maine - impressive quality about them. I'd like to see a used oil analysis on their synthetic.
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