It improves throttle response , the more miles on it I vote yes . 500k 300cd turbo of mine responded well too the service 3 years ago . Just did a valve adjustment last week on her All the hoarded 300cd parts are being applied ., 2 doors replaced with working window regulators , plus . Replaced rear seat , plus . . I’m so glad to still have this car , a touchstone amongst the better shape cars .