Just found out my torque wrench is off by 15 ft-lbs after 3 years of use | Contractor Tools - Freelance Forum - The Community for Independent Professionals
Can't believe it was off by that much after just a couple years. I always figured torque wrenches drifted a little, but twenty foot-pounds seems like a huge jump to me. Hope your buddy got lucky and didn't have to pull the whole engine apart.