10w40 to 20w50 Do I need to flush?

I just switched to 20w50 for the warmer weather do I need to change out the 10w40 then run it then change it again.

No...

I just switched to 20w50 for the warmer weather do I need to change out the 10w40 then run it then change it again.
Don't worry about it!

No again....

torch

No, just change it and go for a ride...

No don't hassle over it they will blend fine.

the 20w50 will blend with the small amount of 10w40 that is left in the motor, not a problem at all.

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