As many of you know I have an '88 Ford Escort with over 518,500 miles on it. For the first 12 years of it’s life it was used as a work car and was driven on dusty construction sites daily. Even though I performed regular maintenance there’s a considerable amount of sludge in the engine probably where dust entered and mixed with the oil. Last spring I had to remove the oil pan and clean the pick up screen for the first time in the car’s life, because the oil pressure was low. This brought the oil pressure back to normal, but now I’m noticing the oil pressure is dropping below normal again so I assume this sludge is starting to turn loose and is clogging the screen again.
I was wanting to get opinions on whether to use any type of engine flush to help loosen the sludge before removing the oil pan to clean the screen again or just leave it alone. If you suggest a flush tell me what you recommend. My concern is if I use a flush it will continue to loosen the sludge even after I’ve removed the oil pan again and cleaned the pick up tube. Removing the oil pan and cleaning the pan/screen is a several hour job and I don’t want to have to do this every 6 months yet I want to see how many miles I can get out of the car before it wears out.