So I'm in a situation where I have to use my old tires. I know that they are 215/45/18 and the ones I'm running on right know are 225/40/18. I was wondering if I could run those 2 different sizes for a short period of time?

 

If the diameter differs at all, your AWD will not like it one little bit.

Move heaven and earth to avoid having to use mixed tyre sizes...

Rich

 

after getting a puncher and putting on the steelie, it lasted about 100m before the 'requires service' symbol came on the dash - the car doesn't quite like much