DOT 5 Brake Fluid in '82 240D
I am getting ready to replace the master brake cylinder on my '82 240D. The recommended fluid is DOT 4 but an autoparts salesperson told me that DOT 5 is available and is better than DOT 4 because it is synthetic.
Is it OK to use DOT 5 in a car this old? Is it compatable with the current seals that are in the brake calipers?
Thanks for any advice.
'87 300 SDL