Hey bitogers! I'm trying to get all my ducks in a row with my wifes 95 Toyota Corolla. I have all the service records back to the first oil change and do not show any mention of any oil changes on the manual transmission. I have the Haynes manual and it states GL4 or 5 and 75w90 or 80w90 can be used. I was going to grab a gallon of Supertech 80w90 since it is cheap and run it for an oil change or two then move it on up to a better gear oil. My question is would it be ok to run the Supertech 80w90 in there? I know ST got in trouble a few years ago due to the loose regulations on their gear oils. Here's a link to what I'm looking at and bear in mind this is strictly from a price standpoint.
http://www.walmart.com/ip/Super-Tech-80W-90-High-Performance-Gear-Oil-1-Gallon/16795067
http://www.walmart.com/ip/Super-Tech-80W-90-High-Performance-Gear-Oil-1-Gallon/16795067