i am doing my research on auto rx, and LC 20. which would be best to use, for cleaning pistons,a nd crud and oil that has built up in an engine? i have a 1995 neon SOHC eninge. has 74,200 miles, gave it 3 month oil changes, bought it when it had 30,000 miles on it, 6 yeas ago. i am only doing 800 to 1,000 miles in 3 months, but would like to try to extend my OCI to 5 or 6 months. would auto rx or LC20 benefit me in these applications?