Super or Regular ? Seems to run the same

[mfn1194]

If I put in 93 or 87 I cannot tell the difference. Maybe there could be tenths of second, but nothing I can tell in daily driving.

'03 Sedan

Save your money.

[Rex]

If I put in 93 or 87 I cannot tell the difference. Maybe there could be tenths of second, but nothing I can tell in daily driving.

'03 Sedan

Save your money.

Just curious, how many thousands of miles have you been performing this experiment?

[Omegamerc]

I notice a huge difference in my car when putting 93 vs 87. I have a theory though. At 1/4 tank, regardless of what octane I have, power seems to really dwindle down. My theory is that large octane strings that provide more power are heavier, and go into the engine faster then the small strands. Unless the ECU compensates for how much gas you have in the tank and adjusts intake into the engine adequately?

[SVTCOBRA]

Yes, if you are happy with 87, save you money!!!

My car likes the premium!!! Makes it go much more faster! and doesn't PING!!! Pings with the regular stuff. Turn down your radio and check.

[gwoods]

The car will pull timing if the knock sensors hear detonation. So yes you can run 87 octane your just running at the edge of the amount of timing the knock sensor can pull.

Why risk your motor over $3.40 a tank? (17 gallons at .20 diff in price)

Jeff

[gwoods]

Also that rating is an AVERAGE rating. You could be putting in fuel with an average rating of 87 octanes and get a tank of 85 octane.

This is what you risk.... look close at the ring land of #3. If you don't know which is #3 run Premium

[grantman240z]

This is what you risk.... look close at the ring land of #3. If you don't know which is #3 run Premium

[gwoods]

I know how to do this chit myself so it only cost me $160 to put in a new rod/piston/rings/bearing/headgasket/head bolts

But the 2 weeks waiting for parts SUCKS!

[joe603]

Just use premium. The factory recommends premium...use it.

Please don't let this thread start a pissing match...I've seen it before

[G_whizz]

[gwoods]

Just use premium. The factory recommends premium...use it.

Please don't let this thread start a pissing match...I've seen it before

zipping back up

[SVTCOBRA]

But, does the tornado really give you 12 more HP?!?! Is Mobil 1 synthetic really dyno juice?!?! Does a K&N really work?!?! Should I put winter air in my tires now or wait another month?!?! Hey, where is all my money! Where is zozo!!!

[jdshift]

You cannot tell the difference with performance when you use 87 over 91, And vice versa? I could tell when I tried 87 once, it hurts the performance. Also like the members are saying, more than likely it will hurt the engine. Stick with what the manual tells you............knowing is just half the battle.

[redhed]

the one ? i'd like someone to answer is why my owner's manual recommends 87 or higher octane for an '06 automatic sedan...but 91 or higher for the '06 automatic coupe. they are both rated the same hp/torque. suggests to me that there is no problem whatsoever using 87 or higher octane in the automatic coupe.

[zozoka1212]

But, does the tornado really give you 12 more HP?!?! Is Mobil 1 synthetic really dyno juice?!?! Does a K&N really work?!?! Should I put winter air in my tires now or wait another month?!?! Hey, where is all my money! Where is zozo!!!

Hey I am kind of lost. I am house hunting in the last week or so. I(my wife)want to buy a bigger house Well I want a bigger garage. I just don't like the idea to move and looking for house all the time. Today my wife scheduled to see 7 houses.

Did I tell you I love her .

I've got a little time from my work so I am not working crazy now my wife scheduled all this.

I have to go I'll be back tonight to read some.

zozo

[Rooster Cogburn]

Diesel works best.

[telcoman]

Just use premium. The factory recommends premium...use it.

Please don't let this thread start a pissing match...I've seen it before

Ok but I use regular 87 octane. 41k miles, no ping, no problems

[SVTCOBRA]

Used to have two 4x4 pathfinders. I could get away with middle grade in mine (5 speed). However, my wife's AT would ping. Had to run higher grade. Also, I hear pinging when most people don't....Both of my AT's ping on the 87. CAN'T STNAD THAT SOUND!!!

[eastvolt]

Diesel works best.

Hmmm . . . i was wondering why my car stopped running after i filled up last time.

[soul_hfk]

Please don't let this thread start a pissing match...I've seen it before

/me starts to pee all over the board

[mfn1194]

The Manual says you can use 87.

They built the car, I trust them.

I doubt they would allow you to use fuel the could "ruin" the engine.

The day someone wants to race me for money, maybe I'll use Premium.

Otherwise I get by just fine for daily driving with 87, no pings , no problems. :-)

[joe603]

The Manual says you can use 87.

They built the car, I trust them.

I doubt they would allow you to use fuel the could "ruin" the engine.

The day someone wants to race me for money, maybe I'll use Premium.

Otherwise I get by just fine for daily driving with 87, no pings , no problems. :-)

You'll have to be more specific on which model/year you're referring too. The manual for my 05 coupe has premium as the required fuel.

[SVTCOBRA]

Joe, I think he said 03 sedan earlier.

I don't think he said it was a G35 though.

Tom are you posting about a 2003 G35 Sedan???

Oh, and my 2005 G35 Sedan manual says Premium FTMFW!!!

[mfn1194]

It's a 2003 G35. Manual says use min. of 87 octane.

the car does not ping, even going up hill under heavy acceleration.

car runs great with 57K miles. I'm keeping it to 100K. I have little doubt it will easily last to 100K miles. Will it last to 200K miles ? i don't know, but it wont be my problem

[eastvolt]

i have a 2004 G35 sedan, and i once put 87 octane in it and it ran like crap - pinged all the way home!!!

[joe603]

It seems that there was a change from 03 to 04 sedans...

[SVTCOBRA]

It's a 2003 G35. Manual says use min. of 87 octane.

the car does not ping, even going up hill under heavy acceleration.

car runs great with 57K miles. I'm keeping it to 100K. I have little doubt it will easily last to 100K miles. Will it last to 200K miles ? i don't know, but it wont be my problem

If mine would run on 87 octane without pinging and felt no difference in HP, I would do it! I'm jealous

[gwoods]

It seems that there was a change from 03 to 04 sedans...

Probably a change in compression ratio and power output too.

Knock sensors have a range, they can pull and add timing within that range. If the gas is bad enough to be outside the range of adjustment you'll have pings and knocks and unusual timing which does damage to the motor.

If the manual calls for 87 run it if it calls for 91-93 run it.

Jeff