This is what I do every six month
on all the 156's I have owned, so far I haven't had to replace any wishbones, no squeaks and all have flown through the MOT's
Prevention is far better than the cure!
What you need:
Red rubber grease
Silicon lubricant spray
Hyperdermic needle large bore and syringe (ask a friendly nurse, diabetes dependant or even a pharmacy)
jack up one side at a time and use axle stands for safety, remove the wheel for better access and turn the steerring wheel on full lock to the right.
Spray the silicon lubricant into a jar or glass until you have enough to fill a syringe by sucking it up via the hollow needle.
The outer edges of the round wishbone rubbers are what you need to lubricate where it seals against the alloy of the wishbone.
About 1mm away from the alloy at positions of 12, 3, 6 and 9 oclock slowly push the needle through the rubber and apply pressure to the syringe plunger while pulling the needle back out, now repeat the process at the next position... Until you have done all four quarters...
Now turn the steering to full lock left and repeat the process on the other bush, same side.
Replace the wheel and repeat the process again on the other side of the car, job done.... It lubricates, feeds and slightly swells the rubber bushes so they don't shrink and have a nice tight fit in the alloy casing.
So what was the red rubber grease for? Well thats to be used once a year
You mix it 50/50 with the silicon lubricant so its thin enough to be able to be injected via the syringe in the same way but this time you push the needle all the way through to the long bolt that goes through the bushes and lubricate around that too...
No squeak, no rattle, no need to strip and rebuild
About £7.00 per year and 1/2 hour
of your time!
This will only work if you have fairly new wishbones and bushes previously fitted... As soon as a bush starts to squeak, do it right away... leaving them to squeak for weeks until you can be bothered to do it... Well, then it is far too late, the damage has been done and your bushes lost the "Friction battle"
against the alloy that is supposed to hold it