Regular gas is fine for the V12 engine. No problem.
The heating problem: if the fan only blows when you turn the thumbwheeel to max over a certain resistance, then the "sword" is defective.
Go to may page and read all the links. There are wiring diagrams, and a lot of other pages how to repair.
The sword thingy is shown on the e34.net.
And the seat twisting problem is shown on Gale's pages.
There are a lot of things, but they can be solved. First start reading all the links in my website and then you have a more clear picture what has to be done.
If still something is unclear, just ask, there are a lot of people with a lot of knowledge.
Good Luck with your repairs.
PS: Headliner I have done abt. 3 months ago. Just go to my website, there is a nice description and a lot of pics.
Not so difficult, but takes one day to do it. Better with 2 people.
The 750iL has larger doors at the back, so it is much easier to get the headliner out thru the rear door.
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