Gas here in GA is up to $2.25 for premium. Is mixing 50% 83 with 50% 93 ok for a WRX ?
- posted
18 years ago
Gas here in GA is up to $2.25 for premium. Is mixing 50% 83 with 50% 93 ok for a WRX ?
Does WRX require premium? If not you are wasting your money. Mixing in a car that does not require premium is OK but premium gives nothing extra except cost. Frank
Yes it does require premium.
USE regular and save a buck. in your manual it will say 93 recommended. No harm will come.
In my '02 VDC H6, premium is recommended, but regular can be used if necessay. I alternate generally every other fill up between mid-grade and premium. I haven't noticed any negative effects. John
PS Good to see another Georgia Suby owner!
Manual says 91 minimum. Go lower and risk pre-detonation (knock). Its your car. Pay now or pay later.
Warranty will cover any "damage" . A friends passat turbo requires premium but hasnt had it in 124k miles and the many problems this car had were not fuel related. No manufacturer will produce a car that easy to damage as they will pay warranty claims on a car that fragile. You may lose some performance but thats it .
Not for disregarding manufacturer's specs.
The ECM will detect any predetonation and retard timing accordingly to prevent it. However, expect power to decline, as well as gas mileage. Not by much, but it will probably be noticeable.
JazzMan
For WRX: Manual says "engine is designed to operate using premium unleaded gasoline with an octane rating of 91 AKI or higher."
The ECU will retard timing AFTER it detects knock from detonating lower octane fuel. The two negative aspects to this are a) ECU responds only post-knock event, so damage could already have been done; b) the retarded timing will result in less power ("Gee, the car feels slowwwww"), and less miles per gallon.
Like another poster said, your car, you decide. I don't do it in mine, you can be assured.
Not so, as cars get more miles on them some tend to build up deposits which can raise the compression ratio and make premium...or at least higher octane than regular... necessary for reliability and performance. Subaru's are notorious for this. TG
On a side note: Does anyone know if that injector cleaner stuff they sell at the gas stations work? You know, the stuff in the little red bottle that you add to a tank of gas? I've heard that the Chevron (Tecron?) works but that the rest, especially the 88-cent Wal-Mart special, doesn't... any thoughts, opinions, or online summaries to the subject?
I've been wondering the very same thing..
I do note that when I use those > On a side note: Does anyone know if that injector cleaner stuff they sell
I've had good results with Chevron's Techron additive in my Ford Ranger's
3.0L V6. The spark knock would go away for 5000 miles or so after using it.Lots of information here:
Blair
A better link just to the additive:
Mixing in a
Well, I have a 1998 Forester that just turned 216,000 miles on the odometer, and I am still running 87 octane, as recommended in the manual. I guess it takes longer than that for the "notorious carbon buildup".
I would use whatever grade is specified in the manual. Saving a few pennies on gas at the expense of the engine is false economy. Conversely, using a higher octane than required is throwing money away.
It does not say "catastrophic failure not covered by warranty will occur if
A few tanks of Chevron Supreme cleared up spark knock and noisy valves in a car I used to drive.
-John
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