I'd like to solicit suggestions for good ways to combat knocking in high-mileage engines, in my car as well as general principles. We have a '90 Mazda Protege with 180,000 miles. It had very little maintenance until just recently; frankly I'm surprised it works as well as it does. It knocks, and it knocks more when accelerating. It knocks a lot with 87 (the original requirement), some with 89, and little/none with 93. We know it leaks oil and the knock may be caused by oil leaking into the cylinder, but there's no white smoke, so I'm not sure. I am on the first phase of a double-whammy Auto-RX leak treatment.
I'm open to anything that doesn't require taking the engine apart.
I'm open to anything that doesn't require taking the engine apart.