OK - I've been totally into extended OCI's - but now I am concerned - as apparently I own 3 different engines that are known to sludge and die early: a dodge 2.7, 5.2, and 5.7 hemi. two of those motors are on Amsoil's sludge list and even Amsoil recommends a 3K OCI for these engines. browse a little on the web and you will see countless stories from people of these engines trashing - some even claim they used 3-5k OCI's - some with synthetic oil. so.... I used to run 7-10k OCI's - but now with even Amsoil recommending 3k.... what do I do?