Quote Originally Posted by ThomasJ2352 View Post
Wow...I hope not...I checked out the manual this afternoon and it says they recommend 91 but could run mid grade or regular unleaded rated at 87 but acceleration would be degraded. It does say not to use below 87. Would a compression test on #4 show the chip if its there?
Yes...cause if the piston chipped, it will most likely damage the valves and they wont seal. You should see a noticeable drop in pressure, if thats the case.