if you need oil, the wrong oil is better than no oil. i usually put one type of oil in my bikes.
I had the pleasure of taking a class in Hydraulics from a man who retired from a major oil company. He spent 20 years in the research and development department of motor oils. Needless to say we asked him a few questions.
Mixing different oils were one. His answer was like Sleds, any oil is better than low oil. The different between brand is almost nill. (The companies regularly analyze each others products) he said if it was him and the oil was low he would;
1. Use the same weight, same type, and brand of oil
2. If the same weight can not be found in that brand, use another brand, same weight.
3.If the same type ( SD, SE, etc..) Can not be found then use what you can find in the same weight and change the oil at your first chance.
4. If the same brand, same type, same weight can not be found then use what you have to but change it at your 1st chance.
5. The brand of oil dose not make a big difference as any of the major brand are of high quality.
6. Do not use remanufactored oil. This is oil that has been used then "cleaned" to remove containments. (Carbon, gasoline, dirt, etc....)
There is more but some of what I was told would just piss some of ya'll off. I will say this what that guy told me made good sense. And with 30 years in the making and develop of oils he should know what he is talking about. Way more than you, me, or the guy at the quicky oil change place. Needless to say I will follow what he told me.
Plus he was a very very good hydraulic instructor.