Date registered: Nov 2007
Vehicle: '73 450SL, '83 300CD, '88 300SE
Location: Upstate Central NY
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New bushings everywhere!!! It seems like the older these cars get, the more likely that anything made of rubber should be removed and replaced with new.
On my 126, I've used a product called Fluid Film to quiet them down to eliminate the noise before i replace the bushings. Fluid film is a product which is used as a rust preventative, it's an excellent lubrciant, cleaner, and it is made of animal fats and wool. It does not seem to have a negative effect on rubber as more harsh petroleums do- WD-40 is a really bad idea on rubber, it's going to quiet it down only as it deteriorates what's left of the bushings. I recommend this stuff to everyone on the forum for just about anything. It has kind of a strong smell for a day, but it stays where you put it, and it lasts for a long time, even through rain.
If the bushings are getting old, replacing them is the ultimate solution, and you're going to be much happier in the long run if you do replace them, it doesn't just quiet it down, but it firms up the car and improves handling.
These old cars deserve it! The engines last forever, even if horribly neglected, but the rest of the car is still a 25 or 30 year old vehicle.