Okay, here's my question for you guys. I've always been interested in how it seems that there are discrepancies between what SAE grade of oil (once the oil is up to operating temperature) and the corresponding ambient temperature in which it should operate.
For instance, comparing two Honda manuals between my Honda motorcycle/car, one states the use of a 10W30 for a cold start of 0 degrees F, with the ambient temperature up to 85F. The other manual states the use of 10W30 from 0F to 100F ambient temperature, both referencing standard petroleum oil.
I've tried researching as many graphs as I can online from reputable sources, but have found it extremely difficult to obtain reliable/conclusive temperature variants. I'd like to exclude within this discussion the use of synthetic oils with a higher Viscosity Index and limit it strictly to standard petroleum oil.
The link below by the API lists what oil to use for cold ambient temperatures: 20W** down to a 32F start, 10W** down to a 0F start, and 5W** for below 0F, but I'm curious for a petroleum oil what temperature a 5W** could safely be started, and then on the other end of the spectrum what the recommended ambient temperatures would be for the 20, 30, 40, 50 grade oil in a multi-viscosity oil.
http://www.api.org/certifications/engineoil/pubs/upload/engineoilguide_march2010.pdf
Here's an example of a graph from Car Bibles.com, but again, the ambient temperatures given vary from many others I've seen. I'm hoping to find a solid bench-mark from SAE or the API rather than trusting someones graph or opinions, and although I understand for most this topic is unnecessary/overkill, for a gear head like myself it has me interested.
https://www.google.com/search?q=oil+viscosity+ambient+temperature&source=lnms&tbm=isch&sa=X&ei=cUnLUuL5AcT6oASM84L4DA&sqi=2&ved=0CAcQ_AUoAQ&biw=1366&bih=666#facrc=_&imgrc=NPG-XyOBpC8MAM%3A%3BtrRK4pWTn2r3rM%3Bhttp%253A%252F%252Fwww.carbibles.com%252Fimages%252Fsaerates.jpg%3Bhttp%253A%252F%252Fwww.carbibles.com%252Fengineoil_bible_pg2.html%3B611%3B667
Let me know what you guys think!
For instance, comparing two Honda manuals between my Honda motorcycle/car, one states the use of a 10W30 for a cold start of 0 degrees F, with the ambient temperature up to 85F. The other manual states the use of 10W30 from 0F to 100F ambient temperature, both referencing standard petroleum oil.
I've tried researching as many graphs as I can online from reputable sources, but have found it extremely difficult to obtain reliable/conclusive temperature variants. I'd like to exclude within this discussion the use of synthetic oils with a higher Viscosity Index and limit it strictly to standard petroleum oil.
The link below by the API lists what oil to use for cold ambient temperatures: 20W** down to a 32F start, 10W** down to a 0F start, and 5W** for below 0F, but I'm curious for a petroleum oil what temperature a 5W** could safely be started, and then on the other end of the spectrum what the recommended ambient temperatures would be for the 20, 30, 40, 50 grade oil in a multi-viscosity oil.
http://www.api.org/certifications/engineoil/pubs/upload/engineoilguide_march2010.pdf
Here's an example of a graph from Car Bibles.com, but again, the ambient temperatures given vary from many others I've seen. I'm hoping to find a solid bench-mark from SAE or the API rather than trusting someones graph or opinions, and although I understand for most this topic is unnecessary/overkill, for a gear head like myself it has me interested.
https://www.google.com/search?q=oil+viscosity+ambient+temperature&source=lnms&tbm=isch&sa=X&ei=cUnLUuL5AcT6oASM84L4DA&sqi=2&ved=0CAcQ_AUoAQ&biw=1366&bih=666#facrc=_&imgrc=NPG-XyOBpC8MAM%3A%3BtrRK4pWTn2r3rM%3Bhttp%253A%252F%252Fwww.carbibles.com%252Fimages%252Fsaerates.jpg%3Bhttp%253A%252F%252Fwww.carbibles.com%252Fengineoil_bible_pg2.html%3B611%3B667
Let me know what you guys think!
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