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nautica_guy
 
I accidentally regular gasoline into a premium only car ...

... is that bad?

No but seriously, I accidentally filled up on regular not thinking that my new car requires premium only. The only reason was because my previous car took regular like a champ and I didn't catch my mistake till it was too late. Now I'm sort of worried and being that I just got the car, I'm paranoid that I might have already f*ed something up. So far I haven't heard any knocking and I drove almost 200 miles on it already. The moment I realized my fopaux, I started driving like a grandma trying not to push the car hard.

What I want to know is, did I screw up majorly and will this cause any short or long-term damage to the engine? And what is the best way to remedy this situation? My cousin just told me to drive it till the light comes on and fill it up with premium the next time around as well as from now on. By the second or third fill, my octane levels should be back to optimal. Should I waste my money on octane booster or just do what he says?

For reference, regular around here is 87 I believe and the car requires at least 91 which I think is actually lower than premium which is 93. Also, the car is a Lexus IS350.
Old 05-25-2009, 06:03 AM nautica_guy is offline  
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SaltForYourWounds
 
It might run a little rough, dont beat on it.
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Old 05-25-2009, 06:05 AM SaltForYourWounds is offline  
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Social Misfit
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No. It's fine. You people overthink hings waaaay too much.
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Old 05-25-2009, 06:12 AM Social Misfit is offline  
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MasterOfNone
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If you're really worried about it, just fill up now with 93, or 94 if there's a Sunoco around.

Also, "premium only", or "premium recommended"?
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Old 05-25-2009, 06:15 AM MasterOfNone is offline  
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nautica_guy
 
Both the manual and the gas tank cover say premium unleaded only. And I actually did go somewhere yesterday to top it off with 93. I was only able to put about three gallons into it though.
Old 05-25-2009, 06:24 AM nautica_guy is offline  
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wadie
 
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I wouldn't worry about it if you're not noticing any knock.
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Old 05-25-2009, 06:29 AM wadie is offline  
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someone else
 
The car will pull timing and prevent knock. You'll be fine
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Old 05-25-2009, 06:42 AM someone else is offline  
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Ezekial
 
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As long as you don't hear any pinging/knocking, you're fine. If you do, just keep off the throttle and you'll be fine.

If the pinging/knocking sound is present, throw in some octane booster and you'll be golden.

Either way, you want to run the lowest octane possible in your car as you'll get the most power, best burn, and save $$. Using anything higher is just throwing money out the door.....
this is factoring out recommended octane, and a car that can really adjust itself to lower octane... I have never had one (or even drove) that could though, so I don't know if they even exist They do exist though, as I can think of the 08/9 Bullitt which adjusts itself to lower octane by pulling back some timing.

:edit
as someone else said, you can run it down to a 1/2 tank and throw in some 93 to balance it out
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Old 05-25-2009, 07:11 AM Ezekial is offline  
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You'll most likely get worse mileage than you would with premium, and have less power. However you aren't going to harm it.
Old 05-25-2009, 07:31 AM Junkie Mod is offline  
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#9  

DvBoard
 
Don't push your car hard, be easy on it and keep the rev's low and you'll be fine. Fill it up with 93/91 when it gets down noticeably and eventually you'll get to the point were it's just like it was 91.

As for the above posters, they are right to say the engine will compensate, but it has to ping/knock at least once before it can do that, which isn't good for the engine, although it might not hurt it in the long term.
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Old 05-25-2009, 07:38 AM DvBoard is offline  
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nautica_guy
 
Hey, thanks for the words guys. I feel better already. I'll definitely heed the advice from here and take it easy on the car for a while ... at least until the next fill up.
Old 05-25-2009, 08:01 AM nautica_guy is offline  
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snugglecaekz
 
use some NOS
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Old 05-25-2009, 08:26 AM snugglecaekz is offline  
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Continental
 
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Quote:
Originally Posted by someone else View Post
The car will pull timing and prevent knock. You'll be fine

Wrong, the car will only pull timing once it detects knock. Do NOT drive this car hard. You're probably going to be ok if you drive it normally, but even still, I regularly hear cars going down the road pinging away, with the Asian/Indian/Soccer Slut/Idiot driver totally oblivious to it. Infinitis, Nissan 350Zs, and the occasional Lexus. If the engine's compression ratio is high enough, it will ping all the time on regular, so yeah, drive her really gently until you can fill it with premium again.
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Old 05-25-2009, 08:27 AM Continental is offline  
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Continental
 
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Quote:
Originally Posted by totensiebush View Post
You'll most likely get worse mileage than you would with premium, and have less power. However you aren't going to harm it.

It's actually the other way around. Lower octane fuel burns faster, so if your car is designed to run on premium, putting regular in it will effectively increase ignition timing, giving you more power, so long as you're not actually pinging. If you're driving it very gently, as you should be doing with this mistake, you will actually see a tiny improvement in mileage over driving the same way with premium.

True story, I know this because of my learnings. I run 14 initial timing on my 455 in the Bonnie(36 total), thus absolutely requiring premium, but for long trips where gas mileage is the goal and I know I will drive it gently, I put in regular without changing the timing and I get about 1 more mpg than I would with premium.. And of course, 1mpg is big when you only get about 14-15 on the freeway. I also notice it is ever so slightly peppier off the line, and doesn't require as much throttle to maintain speed on the freeway. Yes, these are tiny differences that the average driver would surely be totally oblivious to, but they are real.
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Old 05-25-2009, 08:31 AM Continental is offline  
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I was assuming that it was pinging and retarding timing. You're correct that IF it doesn't retard timing it should get better mileage.
Old 05-25-2009, 08:46 AM Junkie Mod is offline  
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