I have an 04 G35 Sedan 6spd (158,000kms) and put in min 92oct. The car will still det at high load low RPM with this. The VQ engine is very prone to det and needs the higher octane gas.

You will also get better gas millage on the 92 over 87. With 92 in all city driving I get about 550kms per tank and with 89 I get about 490kms (only did it once by mistake). Not a scientific test but was enough for me to stick to the 92minimum.

Jeremy

lol that's what i've been told by many g owners. for me i woudlnt' care i put 92 in my 240sx.

So much stupid in this thread.

His G35 will be fine if he puts 87 octane in.

Ecu's can do amazing things... like retard the timing so the engine doesnt knock...

I'd also like to mention your friend is a retard and if he's too cheap to buy premium maybe he should buy a car that does not require premium?

Sometimes this forum blows me away...

if u can afford the car, then u can afford the gas, if not then dont buy it!

anyways, ask the sales guys at Infiniti, ask a couple of dealerships.

The BMW guys told me to alternate between regular and premium when i went and ask.

who are the BMW guys?

Don't tell me some random guys who work at dealerships. The engineers who designed the car knows about cars better than they do.

I'd say stick to premium gas as it is stated in the owner's manual.

That's not true.

When a gas station needs more fuel they request it. There isn't a specific brand of fuel that is different except Chevron. Shell, Petro, Esso, Husky etc all use the exact same fuel.

Chevron is the only company that uses an an additional additive (techron).

I laugh at the people who "only fill up with X gas cuz its the best". (unless it's Chevron).

I know this because I know someone who works at a fuel transport company in the lower mainland.

QFT!

well, I had experience with 93 prelude SR using 87 octane for a year and the car wouldn't start one day. Had the car towed to the dealer's and they took a look and asked me if I had use 91 octane gas... anyways I ended up paying the price for being an cheap ass. So do your buddy a favor tell him to follow the minimum octane requirement or it's just more trouble down the road.

Don't knock sensors have to detect a 'knock' before they retard the timing? With lower than recommended octane, knock may happen, but the sensors can read it and compensate. Wouldn't it be better to have no knock at all?

What was wrong with it? What did they discover?

Using 87 in your honda land yacht may increase the potential for detonation to occur which is really the only reason your engine will be damaged from using the incorrect octane rated fuel. So if your car just "would not start" one morning, the chance that was related to using the incorrect fuel is almost impossible. If the motor failed due to detonation there would have been a major component failure that more than likely would have happened under load and either been audible or had other obvious symptoms like smoke pouring out of exhaust/under the hood/etc...

Again though, if you're too cheap to buy premium, buy a beater.