I needed some SAE90 gear oil, not EP, a few years ago and had to go to a supplier of vintage car bits and pieces to get it. He sold me a 4 litre container of Penrite Transoil 90 Straight Gear Oil. It was the right stuff, but it cost about 50% more than EP90 would have. It is odd really, because quite a lot of manual transmissions that require SAE90 oil have bronze synchronisers, and certainly shouldn't have EP oil in them, but that is all home mechanics can get, so they use it. A couple of years later I picked up the last 5 litres of dregs of a 205 litre drum of straight 90 in the liquidation sale of a petrol station for $2. I also could have got both of my favourite stick welders for 30 bucks each, but unfortunately I already had them both (for four times that, from farm clearing sales). In the end, you have to buy things when you need them, not when the price is right.
At least you've got the oil you need now, and it will take you a while to use up 5 litres.
