I don’t know if it leaks running or not, I should have checked. It definitely looks as soon as it is parked or stopped and the engine is off. It leaks a lot after it is shut off. I have read of others replacing the bushing with a Chevy but couldn’t find specific years or models (turbo 350 or 400?) and there were warnings of installing them too deep etc.. so I was hesitant to do that.