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Message: <blockquote data-quote="killagt" data-source="post: 980506" data-attributes="member: 9990">Hi im just finally back to stang world, own a 98 gt 5 speed few year  back, and move to camaro and own 4 of them, now im back to stang world  again, it good to go back.Im doing maintaince to the car now, I have few question. car is mainly  weekent drive, no racing, it have full intake and header to full exhault  systemOil weight recomemnt , car is around 140k miles, do leak a little, but no oil burnIt automatic tranmission, how hard to change oil the tranmission fluid, and what kind of fluid ? ( dex/mercon )rear diff gear oil, what weight is recomment ( 80w90 valvoline durablend  with ford lsd addictive ? ), can I use synthetic on these rear end ? I  like redline 75w90, btw is 95 gt and 98 gt different on differential ?  or it the same ?what other recomment thing do you guy recomment to do while im on doing maintaince stuff ? thanks</blockquote>