It should be in the boot usually on the right hand side.
on my 89 its under the rear passenger side seat
An E38 750il uses 8 quarts even.
in the trunk on the right side behind the panel. Yo might have to bend down to see it
where is the starter
The 1988 E32 BMW 750iL can accelerate from 0-100 km/h (62 mph) in 7.4 seconds and has an electronically limited top speed of 250 km/h (155 mph).
It was a black BMW 750iL sedan [BMW 7 Series (E38)].
The BMW 750il has a "sealed for life" ZF transmission. There is no dipstick. Still would recommend changing fluid & filter every 100k.
for a complete oil change, the 2001 bmw 750iL requires 8.5 quarts or 5W30 or 5W40 full synthetic oil.
1-7-5-11-3-9-6-12-2-8-4-10
E38.org/E32 has all of the info and links.or here,http://manualspace.com/manual/search/1990-bmw-750il-shop-manual.htm
The BMW 750il model seats a total of 5 people. In the vehicle, there is one driver's seat, one front passenger's seat and three rear passenger's seats in total.
for a 1994 750il it was approx 88,000