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My last oil change I put 20w 50 in not knowing it takes 10-40. Will it hurt if I put the right stuff in now, or should I just keep changing it with 20-50?
 

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Nah, you're ok. Depending on your location, it may actually be the better choice.
When i lived in the Phoenix area, i'd run 20-50 for three seasons and 10-40 during the winter. Now that i'm in a much cooler climate (upstate MN) i've reverted back to the 10-40 all year.
I'm not too familiar with the summer temperatures in Columbia City, but my guess is that during the summer, either would work fine for you. During the cooler times of year though, switch back to the 10-40, the initial lubricating qualities are better with the lower viscosity when cold.
 
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