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Showing results for tags '75w-90'.
Hi, I've been lurking for a while with my 2004 CTT. I love the car and haven't really had many issues other than the normal coolant pipes. I do all my own work, and this is my dail driver, so the work is much more simple than my other cars. I have two, hopefully, basic questions: 1. the Diff "Locks"...are those viscous diffs or truely locking? 2. Because Burmah oil is hard to come by in the states, is there a fluid that is recommended other than the porsche part? i know redline has a gl5 rated fluid, but if there are clutchpacks in the lockers....i would hate to decrease the locking ability of the discs by using a full synthetic oil. I've seen people using M1, Redline MT-90 all the way to 75w-90 GL5, AMSOIL... My theory is if the lockers are truely mechanical, then i won't be as worried with a change in gear oil....but if they do rely on friction discs.....i'll stick with the OEM. TIA