Originally Posted By: crazyoildude
ever hear the phrase if it aint broke dont fix it? im not knocking auto rx i am just saying from all my experence in the engine rebuilding industry (too many years to mention) when you start "cleaning a good running engine" a lot of times you are asking for trouble big trouble in most cases.. Don't mix anything with your oil unless there is a good reason for it The oil companies spend millions to formulate their oil and too add anything to it throws off the whole additive package.. Again im not saying auto rx is a bad product im just saying be careful your rings and bearings depend on it not too mention everything else..
+1 Well said IMO. I've read several posts on Bitog where posters using rx have developed engine rattles, ticks (noises), and leaks after/while using rx.
To the OP's question. As said earlier, I'd use a quality SM rated oil(regular or hm), a quality filter, and shorten up the OCI to 3k. If you want to run PP, that would be fine, but I wouldn't extend the OCI beyond 4-5k.
Here's why I'd say to try that first. You've got no leaks, it's running well, and 4oz of oil burn off over 2k is very low, especially with 143k on the clock.
HTH
J