yes it can as the oil only acts as a medium to transport the treatment to all of the metal surfaces within the engine/Gearbox etc

all oils

Yes works with all oils.

Yes, Any type or grade of engine and gearbox oil, and can even be added to water if there is metal you need to protect from friction (like a water pump)

yes as it is not part of the oil, it just sits in the oil till it can bond to the engine surface

you can even put it in your coolant, any part of the engine that has a fluid, zx1 can go in it

yes

Yes it can be added to the new oil after your regular service

Yes, best time to do it is when you've done the oil change.

Yes, ZX1 can be added at any time,new or old oil. It is only using the oil to transport itself to treat the metal.

My current usage is for (a) Meriva 1.7
CDti and (b) Lotus Exige S. With this
product therein, I have use both cars
(&others) to motor to Lisbon & back
and found that no measureable
amount of my basic synthetic engine oil was used. I have used it at servcing
& as an additive in normal use.

yes It can be used on a LPG conversion. you can just add it in as it is or after an oil change.