Neither of those oils are indicated for these engines. OHV engines generally use 10W30 and L-head engines use 30W. Nothing prevents you from mixing weights, just check your oil level before starting.
5w30w full synthetic diesel oil
5w30w
720ml 5W30W
you can not mix hydraulic oil in engine oil because if you do a fire will occure and then you will blow up in a million pieces.
Yes, you can mix them.
Yes, you can. It is even sold as a Synthetic Blend.
Look on the oil container and the engine that you want to use it in. The engine will tell you what ratio to mix the oil and gas at. The container of oil will tell you what amount of gas should be mixed with it. I have found that the best way is to put the oil into an approved gas can and then add the gas to it. This helps to mix the oil better.
Krytox will not mix with engine oil
Yes but I would not mix these as the viscosity is not the same.
Blown head gasket
If the engine has a dip stick or oil fill plug, so that you can check the crankcase oil level, then it is a 4 stroke engine and no oil / gas mix is required.
No it is 4 cycle oil, 2 cycles is the only oil you mix with gas for 2 cycle engines. They may be referring to a syn/ conventional oil mix that they have preformed to improve their oil. It will work fine in your 4 cycle engine as long as it is the correct weight for your engine. As long as it is like 10w30 you should be good to go.