one of the things I was told for when driving around with seafoam treatment was to bring the car to the upper RPM range, running engine at peak.

and despite what you read, all oil will only last in an engine for a set period of time, brand doesn't matter, only type (synthetic vs dino). synthetic can last in a clean engine up to 6000 miles, dirty engine 5000 miles, dino will last in a clean engine 5000 miles, a dirty one 4000 miles. sometime you can push these both another 1000 miles, but it's all on a case to case basis. to decide between syn and dino, you need to determine if you have any kind of leaks that the thinner syn oil might seep out through.

another booster, if you will, that will cause some noticeable difference is to run some higher octane gas with some fuel injector cleaner in it, either chevron w/ techron 93 or shell V-Power (93?).