So, I drive a lot for work and I've owned a lot of different cars. Honda's, Toyota's, Buick's, Chevies, Suzuki's, Hyundai's..you name it. Old stuff, newer stuff too.
The 1998 Q45t is the first Infiniti or Nissan I've ever owned so i thought I would share my opinion after owning it for nearly 7 months and 25,000 miles.
Quick background: I bought my Q from the second owner who purchased it off-lease in 2002 with 39K on it. Always garaged, always maintained. They are older, affluent, and his wife drove it mostly. So, no need for a "abused car" response.
What I like:
1. The power. I know from lurking that 4.5L owners turn their noses up at these cars because they aren't a...4.5L, but nearly 270hp out of a 4.1L engine is nothing to sneeze at. It's right up there with BMW's and Mercedes' of the era. As far as not being as strong internally...has anyone really even managed to blow a 41L up? If not then that sniping about them is for NOTHING.
2. The reliability. Nothing has broken and my car gets driven hard at times. Front end is tight at 223K miles. Everything inside works fine. When you come from a '99 Regal GS and it's innate GM BS problems, you appreciate that even more.
3. Highway MPG. Gets about 23 mpg even with dead knock sensors. There are plenty of 4 cyl mini trucks and PT cruisers that can barely do that.
4. Paint and body. Holding up great. No clear coat oxidation like plenty of cars at this age.
5. Sound level: Quiet car.
6. Stereo. Original Bose system works great and sounds great.
7. Interior lighting. Very nice.
8. Superb brakes. Cross-drilled front rotors are nice.
What I don't like:
1. Oil consumption. 1 quart every 1000 miles. Going past the valve seals.
2. The ride. Too stiff for luxury car. My '05 Accord rode better.
3. Seats are also too stiff.
4. Interior materials/perception of being a prettied-up Nissan.
Seats are leather on the seating area, vinyl on the side. Door armrests are vinyl, door panels are vinyl and not leather. Woodgrain is fake. Unacceptable for a $52K car. No trip computer of any kind, no instant MPG readout. No cornering lights. Says "nice Maxima" more than Infiniti.
5. City MPG. Goes down in a hurry.
6. Lack of cubbyholes and storage. Again smacks of putting a "Cima that we also use as Police cars" into the role of a top-echelon luxury car, which it does NOT fit into.
7. Irritating, time-consuming and possibly expensive emissions-related maintenance and failures. This stiff is straight from Nissan, nothing to do with being an Infiniti.
So, would I buy one again? Sure, if it was cheap enough and these things were not important. I like my car quite well. Just my personal opinion