One-Time Use Bolts for Underbody Shielding?

[bosstones]

My E86 has one-time use bolts (stretched past torque) on its reinforcement plate so it got me wondering if the E84 did, too. Are bolts for any of the underbody shielding one-time use parts?

Now that I can finally open the hood, I can finally start on my maintenance backlog. To do so, I'll need to get underneath but want to make sure I have everything I need before I start. I wasn't having much luck looking this up so I figured I ask this here.

TIA

[wheela]

When you say underbody shielding, are you talking about that big plastic tray screwed to the bottom, that is a barrier between the road and the engine?

[bosstones]

Inclusive of it. I don't think those bolts are but I'm not sure about the "rear engine undercover", which I also cant find torque specs for.

I'm going to be changing out the trans fluid/pan/filter as well as the coolant and intercooler as part of my maintenance list.

[Gamb1t]

IIRC there is a metal shield underneath the engine bay that uses metal bolts. I've removed them for front diff oil change and reused them. No indications that there were one time use. Torqued back up with no problems.

[4_ring_circus]

Usually only bolts that are torque to yield (ex. 90ft lbs plus 1/2 turn) are one time use. The 1/2 turn in the example I gave is where the bolt gets stretched.

I doubt bolts for under shielding are one time use, those shields need to come of for maintenance.

[bosstones]

Thanks, guys. I didn't think the plastic guard would but one never knows. Are there torque specs for those bolts or just 'tighten until snug"?