I have an 03 Touring 6spd, and my dad decided to take it for a drive one day. He comes back and tells me he filled it up..with regular gas despite me telling him premium only. It now has a full tank of regular, and I'm pretty much stuck with it. My question is that should I wait till the emergency light to refill comes on so that the majority of the regular gas is gone before I fill it up with the premium? or should I wait till quarter tank is left? Or does it not matter and I could fill it up when half is left? Basically would it be a problem if I filled up with premium even if some regular is still in there? would it be bad if they mixed? Just worried about that. thanks guys.

 

bump

 

Octane booster?

 

You shouldn't have any problems. Just keep your lead foot off the accelerator and use up about half the tank. Fill it with premium and continue driving conservatively. When you use up that tank full, just fill with premium and drive however you want. Mixing the two kind of fuel will not hurt anything. At the gas stations, they mix regular and premium to make the mid grade gasoline. That way they only need two storage tanks.

 

will do, thanks brotha

 

When you pull into a gas station to fill up your car’s tank, you almost always have a choice of several kinds of gasoline. The majority of pumps usually offer a product called “regular,” other pumps are labeled “premium,” “super,” or something similar, and their product sells at a price about 12 to 13 percent higher than the price of “regular.” The difference in name and price is based on the gasoline’s “octane.” Regular gasoline has an octane rating of at least 87. The octane of mid-grade gasoline will range from 88 to 90. Gasoline labeled and sold as “premium” is required by law to have an octane rating of 91 or higher.

I have a 2003 Performance model, and I’ve never filled with “premium” fuel (octane 91 or greater). In fact I often avoid the mid-range octane rating and just fill with the least costly fuel, “regular.”

So… I’ve been using fuel with an octane rating of 87-90, which is far less than the premium (92 octane rating) Nissan recommends.

And… after 10 years and many miles on “regular,” my 2003 Nissan is running perfectly

You’re good... Don’t do anything

--Spike

 

interesting, thanks for the input

 

The reason you never need respect the octane ration Nissan specifies for the 350z is simply that the Nissan 350z’s computer compensates for the octane content delivered to the engine. In other words, if you load the wrong fuel (the wrong octane value), the Nissan 350z will automatically compensate. It won’t be a problem.

--Spike