regular gas + octane booster= ? RON

MacLean

You have to remember that the dealership put regular gas in your car when you bought it. I doubt that regular gas will mess up the car. Now if you have a turbo charger or supercharger, then that is a different story & you better go premium. Getting the middle grade is a joke & a waste of money. The reason is that you really have no idea if it is 1% better than regular, or a couple % lower that premium. Everytime you change your oil drop in an octane booster when you fill up your car.

j23a45m

constant use of regular gas causes early knock sensor failure!

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Jordo!

Why would you assume the dealer fills it up with regular?

The car is tuned from Nissan to require 91 AKI, and unless you never put it under load, it's a bad idea to run a lower than recommended octane.

Octane boosters, at best, may add .5 AKI.

I don't know of any cars tuned to take advantage of midgrade. Might be worthwhile on an older motor tuned for regular that's prone to ping for one reason or another (e.g., carbon deposits on pistons creating hot spots).

What does changing the oil have to do with anything?

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MacLean

I've heard that whenever you decide to change your oil & you need to put gas in put an octane booster. Put an octane booster every time you fill up if you want. I'm just saying.

Jordo!

There is absolutely no logical reason for that. There is no direct relationship between the oil and the octane requirements for the motor.

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MyZ4U2C

Dealers are cheap and pinch every cent. Most dealers fill the vehicle with regular on new car fill ups and will even have the lot techs who fill it up watch the fill up till the gauge points to the F indicator and save a gallon or so....I would recommend a octane booster at purchase of a new car at least.

MacLean

+1..... Oh I completely agree with you. When I went to test drive the Nismo for the first time we had to stop & get some gas b/c it just got off of the truck a couple days ago. Well the sales guy only put 3-4 gallons of regular gas in it & was going to try to get reimbursed for it.

The higher the octane the slower it burns & the lower the octane the faster it burns.

Jordo!

Uh, a bottle of octane booster isn't going to do much, which is the whole point.

You're better off demanding to accompany them on the journey to the gas pump if you are that worried.

Or tell them not to bother filling it up -- you'll do that.

Failing that, if you are that concerned, drive around at fairly low revs, putting very little load on the engine (less load means less torque produced, means less likely to autoignite -- although it is certainly possible to knock even at idle), get through a 1/4 or 1/2 tank of gas and then top off with high test.

Or break out the siphon hose and start sucking

The message I'm getting from people on here is that they don't trust car dealers as far as they can throw them (fair enough) but they DO trust snake oil salesmen selling unregulated, mystery fuel additives (why?).

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red6spd

Then your dealer is full of morons. The its not recommended to run Premium in these cara its a must. And I'm pretty sure it says in owners manual if u need to run reg get it out ASAP. Why this thread even exist boggles my mind. Don't people do research before buying a car?

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Red__Zed

Yeah, but those people don't wind up here.

37Z

That's what I have reviewed from my on-line research as well. That's why I am asking for other 370Z owners for there experience in adding octance booster to regular gas. Thus far frorm the responses, no one including myself, has added octane booster to regular gas.

MattP725

Also no real benefit of higher octane than you are tuned for. Those products are def not something I would mess with... def won't increase performance, all it could do is hurt.

bvl

Several threads similar to this. Last time I came across one I replied with some of the actual math that one should use to calculate effective octane rating based on adding things.

Math is fun kids, check it out

If you are using a bottle of snake oil, do the math at what it does per volume of fuel you are working with and make an informed decision.

Non-math example with real world economics:

If I use 15 gal of 87 octane, I save about $4.5 vs buying premium (30c per gallon, some spreads are lower so this is a high number). You are not going to raise your the effective octane 4 points on 15 gallons of fuel for < $4.50.

If you find such a product, let us all know. Just watch out for strangers hanging around your house...it may be Big Oil trying to silence you.

- b

Z eliminator

i use sunoco 94 with lucas ocatine boost/

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jay4500

I work for a rental car company , and I am a mechanic , we have several cars that takes premium fuel , bmw,infinity and I don't think rental car companies use premium fuel , and the cars run just fine, no problems from running regular fuel. the ecm compensates for the fuel.