under the left hand bumper
Cruise control vacuum reservoir
Not sure what type you have but, I have a DL station wagon and the fuel filter is located under the hood on the drivers side by the strut tower.
i have a 1989 740 and mine is located on under the hood it the green 1 on the side next to the air filter
The fuse box for a 1989 Volvo 740 Turbo Wagon is located under the dashboard on the driver's side. You can find it by looking to the left of the steering column, near the side of the dashboard. There may be a cover that needs to be removed to access the fuses. Additionally, there is a second fuse box located in the engine compartment for certain circuits.
Volvo recommends using a synthetic oils that is 30/5. They have 30/5 oils for vehicles over 150k miles that work just fine.
Under the glove compartment
10 bolt 7.5
Yes. They are exactly the same as long as the newer wagon is also a 240 (not a 740). All 240 hoods are interchangeable from 1986 on.
9-13 mpg
I own a 1989 745 Turbo Wagon &, a 1996 960 both absolutely trouble free.
Fuel pump is in the fuel tank, the filter, if fitted, is in-line, usually a grey cylinder in the engine compartment.
Yes it should be on the far right of the engine