Quote:
Originally Posted by Nardi330
because MT-90 and MT-85 are GL4 oil. for the diff Toyota/Scion/Subaru specified GL5 oil. i chose 75w90NS because our LSD is a torsen and doesn't need fiction modifier that are in 75w80 and 75w90.
I can't determine the NS is causing any damage but prior to the oil change (it had the oil from factory), the LSD was smooth all the time. now there is very noticible gear noise with slight vibration while turning and standing start at the same time. i don't know if this is normal or not but to be on the safe side i'd prefer my diff to be smooth like it was prior to the oil change.
i also replaced stock gearbox oil with Redline MT-90 and it is much better than before and i gave credit to it. in no way am i bashing Redline over Motul but maybe i chose the wrong diff oil and should used the redline 75w90 with the fiction modifier in the first place. but i'm not going to take chance now as many have reported good result with Motul Gear 300 75w90 so that is what i'm going to use. i will report if the diff is smooth again once the redline is replaced.
if you have good knowledge about oil and stuff as you implied, maybe you can supply us with factual information to show that Redline 75w90NS is or isn't the correct oil for our LSD? i would defintely love to learn more. or maybe you can tell me why replacing stock diff oil with Redline 75w90NS caused the noise and vibration so that i know what's going on. at the moment, i can only go by trail and error.
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I'm putting Motul in mine on the weekend (Gearbox and Diff), and of course have the same add-ons as you do (Cusco and Perrin). Will let you know the results. I've seen one thread stating that the Perrin introduced some harshness into the driveline but that may or may not have been in conjunction with the Whiteline bushing.