I need help with a 1991 BMW 325i.

Aside from the obvious WD-40, is it someplace that is relatively safe to use a torch to warm it up?

Do you have a “shop manual” ?
Some of those things on the firewall require you to disassemble the dash board on the inside of the car to remove them, along with the stuff under the hood.

no, it’s too tight of a space to use a torch, and i used wd-40 it didn’t work. and i haven’t tried taking the dashboard out, i don’t want to but if I have to then ok lol.

Get a Shop Manual for BMW 325i for your sanity! You have to find the right year but you get the idea.

Assuming you can’t borrow someone’s air tools for a bit.

Leverage. If you can get a socket on it, find some mix of ratchet and extensions that you can get a hollow bar over the end of the ratchet to give yourself more leverage. Even if it’s just enough room for 1/8th of a turn or less (one click on the ratchet). For something on the firewall, this usually means your bar will extend up toward the hood, but it may be easier to go down out of the bottom if you can find a space that doesn’t have anything there.

Then hold the socket in place with one hand and pull the bar with the other. It’s a cheap, multi-use breaker bar. I used a tube from an old exercise bike for years.

Disclaimers:

> Make sure the spot where your bar may hit doesn’t have anything breakable. If it does, protect it or even better, consider if there is a better spot.
> This is a great way to strip the threads off of anything, which is a bigger problem. Make as sure as you can that there isn’t something else holding the bolts in place like Tropical Willie said.
> This will break your ratchets if you abuse them. Especially if the bar interferes with the lever that changes ratchet direction. Don’t slide the bar down that far.
> Make sure you’re not pivoting the ratchet on anything that will break, crush, or ideally anything at all. Meaning you don’t want the head of your ratchet crushing something as you torque it. In a perfect world it would stay parallel to the bolt head, but sometimes it’s not possible.

Take your time, breaking something else is the worst way to fix anything on your car. I haven’t found anything short of an axle nut that I couldn’t get loose this way though.