Review on Efficient ACDelco GM Original Equipment 10-4058 Versatrak Fluid - 16.9 oz: Enhance and Protect Your Vehicle's Performance by Shawn Lamp

Factory Oil at "cheap” prices, what better! I've read a number of reviews stating that the new oil eliminates the groaning in the Versatrak's rear differential. My experience is that you can do eighths to get rid of the noise with the oil in the diff now. Just as a test I drove the eight for about 20 minutes to calm the rear end, then changed the fluid (due to a regular service rotation) and drove the car. There was still noise, but now it only took about 10 minutes to get rid of the noise. I'm not sure I can repeat the eighths from time to time to get rid of the tone. The groaning only occurs when there is tension. slow corners so it doesn't really bother me. Summary - If you buy this oil (or an alternative) to get rid of the groan, save your money and ride eighth for a while. Then repeat as needed. Buy this material only if you need to change the fluid. The noise does not depend on the quality of the liquid (unless you have the wrong liquid). By the way, it took me about 3.5 bottles to replace the differential. - No pump required to refill the liquid.