Quote: ..neighbor told me GM had service bulletin instructing the use of ATF to clean and free up noisy lifters.
Been doing that for many years and it has been stated many times her e too. Ad a few miles before and oil change. ATF has very high detergent content. In fact if you have dirty grease cruddy hands dip into some ATF and rub in like GoJo and they will be just as clean.
