Originally Posted By: ARCOgraphite
Originally Posted By: calvinnnnnnnnn
what is the range for 5w30 oils? what is good and bad?
If they are certified to SAE J300 5w appellation then they are all good for that winter service category. There is no good and bad. Its all pretty simple, If you are seeing sub zero starts over an extended period, select a 0w/5w-XX oil, if not run 10w or specified monograde. No need to overthink because it does not make a huge difference in wear or fuel mileage as other factors tend to overwhelm.
If they are certified to SAE J300 5w appellation (6600cP@-30c MAX) then they are all good for that winter service category. There is no good and bad. Its all pretty simple, If you are seeing sub zero starts over an extended period, select a 0w/5w-XX oil, if not run 10w or specified monograde. No need to overthink because it does not make a huge difference in wear or fuel mileage as other factors tend to overwhelm. If you are seeing -40C/F starts then you may want to think harder about w categories (and a block and pan heater)