Premium reccomended? Can I use regular?

Asked by Jan 02, 2015 at 09:51 PM about the 2004 INFINITI QX56 4 Dr STD 4WD SUV

Question type: Maintenance & Repair

So I'm 15 year old guy driving a Infiniti QX56
2004. God I love the car but I hate paying for its
fuel, my mom always tells me to get premium
which before now used to go up to 4.99 where I
lived. So even now that premium is 2.49 and
regular is 2.29, could my car use regular? My
manual says
FUEL RECCOMDATIONS:
Use unleaded at least 91 AKI

2 Answers

5,645

Use premium. If you don't the vehicle is liable to ping and rattle.

4 of 4 people found this helpful.
27,215

The QX56 has a 5.6L V8 engine with dual overhead cam (DOHC). Technically you can use regular 87 unleaded, but the QX56 is tuned for 91 octane fuel, so you really should be using that to avoid knocking & pinging...Knock is never good for an engine, rods, pistons, etc. I have an Infiniti G37x with the 3.7L V6 and it also has a 91 octane fuel recommendation...To avoid any potential problems, I'm sticking with 91 vs 87 octane. I'd recommend the same for you since my engine is a high compression V6, guessing the same for the QX56.

4 of 4 people found this helpful.

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