yeah I guess so. but on some cars your meant to replace the mounting bolts when you've had it off. which in my opinion is just another way to get more money out of car owner. the bolts are obviously not strong enough for the job.
You only need to replace stretch bolts, or those that have been torqued to yield.
The engine mount bolts are grade 10.9, which is an extremely high strength bolt.
When you create a joint with a bolt, the bolt actually carries very little of the load if its torqued correctly. Its the joint that carries the load.
What happens when you don't torque a bolt correctly is that the joint clamping force is poor and you get separation, the bolt is constantly loaded and unloaded. This leads to a failure due to fatigue.
So the moral of the story is always make sure bolts are done to the correct torque.
