The old rule for 30w was 32F.
Lowest temp for SN rated SAE 30 conventional
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Originally Posted by Linctex
About 30 years ago, I had to pull someone out of a snowbank in North Dakota.
It was about -40*F ... my 1951 Farmall "M" had 30W Cenex oil in the crankcase.
It actually started fine (surprised, since it was filled with "summer gas")
It took about 15 seconds to get oil pressure - but it did.
Originally Posted by Linctex
About 30 years ago, I had to pull someone out of a snowbank in North Dakota.
It was about -40*F ... my 1951 Farmall "M" had 30W Cenex oil in the crankcase.
It actually started fine (surprised, since it was filled with "summer gas")
It took about 15 seconds to get oil pressure - but it did.
Way back when my Dad ran Havoline SAE30 in a old International Travelall. In the eastern Oregon desert when it got to -20F or so she started up. That cornbinder made a bit of noise for a few moments then settled in.
He decided to get a pan heater after that.
About 30 years ago, I had to pull someone out of a snowbank in North Dakota.
It was about -40*F ... my 1951 Farmall "M" had 30W Cenex oil in the crankcase.
It actually started fine (surprised, since it was filled with "summer gas")
It took about 15 seconds to get oil pressure - but it did.
Originally Posted by Linctex
About 30 years ago, I had to pull someone out of a snowbank in North Dakota.
It was about -40*F ... my 1951 Farmall "M" had 30W Cenex oil in the crankcase.
It actually started fine (surprised, since it was filled with "summer gas")
It took about 15 seconds to get oil pressure - but it did.
Way back when my Dad ran Havoline SAE30 in a old International Travelall. In the eastern Oregon desert when it got to -20F or so she started up. That cornbinder made a bit of noise for a few moments then settled in.
He decided to get a pan heater after that.
I am currently using 30 in my bike, BMW recommend it from 0 to 30 C. I've been pushing the max temp this summer, but as I'm not commuting on it these days, I doubt if I will be using it below zero. I'd say they have a bit of leeway in their recommendations, so -5c could be the limit.
15F.
Originally Posted by OVERKILL
I'm sure they could be labelled that way, I can't see any regulation that would prevent it. An oil without VII can be labelled as either a straight SAE grade or a multigrade if tested. AMSOIL's 10w-30 without VII is labelled as both.
I agree completely I'd also suggest, generally speaking, an oil company would not want to get rid of all their SAE 30 products and label them simply as a 15w-30 because it might be correct and permissible. As much as I'm no monograde fan, there are applications where they are called for and some people will follow the manual religiously and have no idea that a VII-free 15w-30 is technically also an SAE 30, so will simply change brands rather than substitute in any way with a "multigrade."
I'm sure they could be labelled that way, I can't see any regulation that would prevent it. An oil without VII can be labelled as either a straight SAE grade or a multigrade if tested. AMSOIL's 10w-30 without VII is labelled as both.
I agree completely I'd also suggest, generally speaking, an oil company would not want to get rid of all their SAE 30 products and label them simply as a 15w-30 because it might be correct and permissible. As much as I'm no monograde fan, there are applications where they are called for and some people will follow the manual religiously and have no idea that a VII-free 15w-30 is technically also an SAE 30, so will simply change brands rather than substitute in any way with a "multigrade."
OVERKILL
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Originally Posted by Garak
Originally Posted by OVERKILL
I'm sure they could be labelled that way, I can't see any regulation that would prevent it. An oil without VII can be labelled as either a straight SAE grade or a multigrade if tested. AMSOIL's 10w-30 without VII is labelled as both.
I agree completely I'd also suggest, generally speaking, an oil company would not want to get rid of all their SAE 30 products and label them simply as a 15w-30 because it might be correct and permissible. As much as I'm no monograde fan, there are applications where they are called for and some people will follow the manual religiously and have no idea that a VII-free 15w-30 is technically also an SAE 30, so will simply change brands rather than substitute in any way with a "multigrade."
Exactly
Originally Posted by OVERKILL
I'm sure they could be labelled that way, I can't see any regulation that would prevent it. An oil without VII can be labelled as either a straight SAE grade or a multigrade if tested. AMSOIL's 10w-30 without VII is labelled as both.
I agree completely I'd also suggest, generally speaking, an oil company would not want to get rid of all their SAE 30 products and label them simply as a 15w-30 because it might be correct and permissible. As much as I'm no monograde fan, there are applications where they are called for and some people will follow the manual religiously and have no idea that a VII-free 15w-30 is technically also an SAE 30, so will simply change brands rather than substitute in any way with a "multigrade."
Exactly
Castrol HD (api sn) 30 states "use when ambient temperatures are above 40 F"
https://www.homedepot.com/p/CASTROL-32-oz-Heavy-Duty-Motor-Oil-151B00/205159567
https://www.homedepot.com/p/CASTROL-32-oz-Heavy-Duty-Motor-Oil-151B00/205159567
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