28 in. diameter tires
Open the drivers door and on the end of the door will be an information sticker that shows the size of the tires on the vehicle from the factory
There's a sticker on the door frame on the driver's side door. If you're using the factory size tires, the proper inflation for those tires will be listed on that sticker. If you are not using the factory size, which is NOT recommended, you can see the MAX pressure stamped on the tire. You should always use the factory sized tires that came with the vehicle because your car's computer is set for that size. Your gas mileage will suffer if you use different sized tires than what is recommended.
For a 2005 Mercury Grand Marquis : " regular " unleaded , 87 octane According to the Owner Guide
For a 1991 Mercury Grand Marquis : " regular " unleaded gasoline , 87 octane is used for both the 5.0 and 5.8
According to the 2003 Mercury Grand Marquis Owner Guide : ( " regular " unleaded gasoline , 87 octane )
motorcraft 820 S
use goodyear tires
It is not recommended to use different size tires on a vehicle at the same time.It is not recommended to use different size tires on a vehicle at the same time.
" regular " unleaded - 87 octane
5w-30 is what I use in my 2000 grand marquis, in 2001 ford started saying 5w-20.
hinge hood merqury gran marquis 1978
According to the 1996 Mercury Grand Marquis Owner Guide : ( DOT 3 brake fluid , meeting Ford specification ESA-M6C25-A )