How to never snap a bolt?

[Nads02]

Had this happen a couple of times to me but it wasn't the end of the world, the bolts I ended up snapping was to hold things down.

But now I use WD40 a lot on any bolt I remove. I also heard about tightening a bolt slightly before loosening it to dislodge the rust in the threads? And also to use heat to get bolts out?

Any ideas on how to never snap a bolt?

[Nads02]

Thanks everyone, read everyone's replies and now I'm thinking is it a waste of my time and money to wd40 my car? About once a week I check my fluids, tyres, replace wiper wash, and wd40 my cars door hinges and bolts which I can see. My car does drive very smoothly and I haven't snapped any bolts on my yaris.

But if I was to use the penetrating oil recommend would that be too much? Would I end up damaging threads over time etc?

[Nads02]

Thanks for the replies everyone, I've ordered plusgas for future working on cars. Ideally I want something to spray so it'll do the job. Got a bit of a bargain yaris recently but needs exhaust work, brakes doing up and front shocks have seen better days. Luckily my dad's yaris has a dying clutch, but has a nearly brand new exhaust. Most likely going to scrap my dad's yaris, fix up the new yaris and then charge my dad for the loss (probably £100 as a guesstimate). But will be using plusgas everywhere, snapped 2 bolts before and it wasn't fun!

[Nads02]

g3org3y said:

Should one preferably use an impact wrench rather than a breaker bar if concerned re the possibility of snapping the bolt?

That's what I think as well