Rear differential oil for 05 GTO
By no means am I attempting to hijack this thread but since it has been so informative and it is oil related I figured I would ask. The owners manual recommends 75W/140 plus GM's LSD additive. However this has been superseded by a GM 75W/90 with the additive included in the oil. This reduction in weight has me slightly concerned. Any recommendations would be appreciated. I had read about the Torco but I am not to familiar with the brand and would prefer to use Amsoil, but not sure if I would need a FM with their oil. Thanks