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Thank you for all your answers.

If I understand this right 10w is when the oil is cold and the 30 is the viscosity when it’s at operating temperature, let’s say 190 degrees. My question is how long does the oil stay at 10 . My truck probably takes 6 miles to get the temp all the way up.

Yes I've used some of the Rotella oils in my tractor and some old generators I mess with it's good oil. I may start using it in my mower.

Originally Posted by kschachn Originally Posted by kpack Thank you for your answers. Maybe I should have said any oil , why is it so hard to know what's inside ? I guess black stone is the answer. ExxonMobil is pretty clear for most of their motor oils in this chart, PQIA is another resource...

Thank you for your answers. Maybe I should have said any oil , why is it so hard to know what's inside ? I guess black stone is the answer.

Why is it so hard to find out how much zinc is in different kinds of oils ? I'm trying to find out about bad boy mower Synthetic blend 10w 30.