Has anyone found out if the gm ls lube is needed with the Mobil 1? I tried a search and did find 1 thread that asked this same question but it got hijacked into a sale add for redline and amsoil. Wether or not those are better is a moot point as I have the mobil 1 and it says it has modifiers in it. Looking for info from someone that has ran into this before. I have only 6900 on my 01 z and had a diff leak pop up on it. It only started to leak when it got hot out, I got underneith and cleaned and its not coming from the seals. I want to dump it and readjust the level, i think it may have puked out of the vent.