Just about to replace my subframe due to rotted dog bone bushing, control arms bolt hole somehow ovalised so keep creaking and drop links also noisey. Should I bother to get new bolts for the subframe and dog bone? Can get genuine ones for around £50 on eBay from VAG bolts. Is this worth it? or will the old bolts be perfectly fine? Cars on 144k.

I'd replace anti roll bar bushes whilst accessible whilst subframe is removed. A swine to do when in situ.

I got a second hand subframe from a breakers yard. From a 2014 model with 78k miles. Frame came with roll bar and both lower arms, all the bushing look great 👍 especially compared to my 144k mile ones. Many jobs with one stone for £120 inc postage.

Should be good with old bolts if they have never been reused.

VAG elsawin states that subframe and dogbone bolts are to be renewed, but as long as you dont overtight it should be ok. They are stretchbolts, so maybe not stretch them to much. They are called TTY bolts, torque to yild.

And, yes, it is recommended to at least inspect your stabilizer bushings. If they are good, no need to replace. But as previous poster said, they are a pita to replace in-situ. Better do it when subframe is down. Btw, when you take down subframe, make sure to use subframe guiding location pins. If not, it is likely you need a wheel alignment after work is done.