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Many shops no longer stock gear oil. ATF runs fine in manual transmissions. Many companies use ATF in all transmissions even their manuals.redrumloa said:The one I had was a Mazda MANUAL transmission that uses ATF and NOT gear oil! Each time they drained atf and put gear oil in! I ended up having a long fight with the shop as they tried to cover up their failure... You may want to find out what type of tranny you have and what type of fluid it uses!
I'd have to go track down some oil data. If memory serves isn't 5W-30 about the same as 75W-85W gear oil?