Is one reason that 30 weight oils are thin because...

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11,247
Location
PA
...because you are supposed to mix them with 10w-40 when higher viscosity range is desired? Just wondering if this is the intent of oil companies. I just used 50/50 10w-30 and 10w-40 in an oil-burning Hi-Mi Mitsu because I was reluctant to use just 40 weight. Makes some sense to blend, right? [I dont know]
 
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451
Location
Bribie Island, Oz
Good theory, but I don't think so. Most major oil companies have a range of oils to suit all climates and engine types. From a watery thin 5W-20 up to a nice robust 20W-50. [Big Grin] If you are burning oil, there is nothing wrong with using a 10W-40, or even a 15W-40. You just have to watch your winter temperatures and adjust your cold visc. accordingly. Dave.
 
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