I have a 95 jeep GC 4x4 with 153k on the 4.0 engine. I did the 2 bottle treatment as stated. The jeep was used when bought with 145k and the oil was serviced every 3k with 10-30 dino oil (so they say). The valve train was noisy. Before the test the gas mileage was 16 mpg at 70 mph during a 75...