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i had an old guy moment here. i got oil and filter for an oil change about a month ago, and had some time today to do it. bought the valvoline for motorcycles and after i put the 3 quarts in and started and checked for leaks, shut it down. started to clean up and noticed i had 2 20-50 quarts and 1 10-40. they had them on the same shelf. i know, its partly my fault for not checking each one, but my main question is, will it hurt to mix the 2. i was going to run it and keep an eye on the temperature. thanks in advance.
Oops. Misread the question. No biggie on mixing the oils. It will be slightly thinner than 20w-50. You might get a bit better mileage but your not doing it any harm.
As long as the temps in your area stay below or around 70 and you don't make a habit of sitting at lights cooking the stuff it should be fine.
Once the temps get up much higher than that or the traffic forces you to start idling for longer periods of time, change it for a high grade synthetic.
Changing it now is probably a waste of money, but later when the temps start climbing it will make you feel better and a good synthetic will help cool things down a little better/faster.
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