2005 Solara V6 - which fuel to use 87 or 91+?

[05v6solara]

Hi guys.

My brother/mom use 87 octane on the Solara V6. I am not sure what the long term damage can be from doing this. Any suggestions?

[UltraslowSolara]

althought the user manual suggested you can use 87 octane but i would stick with 91 octane just for the sake of high compression. low octane fuel in the high compression motor would most likely cause detonation, which is bad for your car.

[zoomzoomthis05]

I have a 05 solara V6 I used preminum in mine.. seems to run a little sluggish if I put 87 in it..

[bronzemaxell]

Originally Posted by zoomzoomthis05

I have a 05 solara V6 I used preminum in mine.. seems to run a little sluggish if I put 87 in it..

my opinion, it is all psychological, it will make u feel better if you treat ur vehicle with higher priced fuel.

[zoomzoomthis05]

Maybe right.. But hey Its the first car I bought brand new. It had 2 miles on it when I drove it off the lot..

[robdp]

I read that the 3.3 has 10.8 to 1 compression! Even with the variable timing which would help detonation I would NOT run regular gas. Thats just me! My 11 to 1 70 4V Clev ford wouldnt even start with regular gas.

[arabianobsession]

^My 2011 SE Camry has 10.4 to 1 compression ratio. 87 is all that's recommended for my car. My 2000 Maxima has a 10 to 1 compression ratio and it actually takes premium.

Be your own judge.

[robdp]

I just put a pan of Mobil1 in. I am now running 94 and am happy with the performance! I say it is really up to you!

[87Camry5Speed]

If the 3MZ has dual knock sensors then 87 won't hurt it- the sensors will pull back some timing, to protect the motor, and you'll lose a little power. That should be it for "side-effects," but I'm a firm believer in putting in what the factory tells you to.

[dug320]

I think I will by some more Mobil stock with people pumping 94 into a car that is recommended for 87.

Gasoline is subject to seasonal variations, country regulations and quality.

In the winter manufacturers adjust fuel to compensate for colder wetter weather. USA restricts sulfur levels to a max of 30ppm in Canada manufactures are asked to keep sulfur levels to not exceed 300ppm. Sulfur in gas in a combustion engine are not great combination for engines.

Moisture, age and dirt/rust seriously affect gasoline, some you can control others not.


If you are really obsessed with Octane, why stop at 94 ? Racing Gas is 100 and Avgas is 130.

[robdp]

Why are you so offended that I run good gas and and the best full synthetic oil I can buy for the price?? I change my oil myself and do all maintenance myself. Why do you waste time saying that a RETARTED engine compensated for shitty gas will run as good as a ADVANCED engine running on 92-94?
As for sulphur content.. I bought a 3.3V6 .... HELLO
Ill race your clown ASS any day

[robdp]

Should have got on the site GROCERY GETTERS of NORTH AMERICA??

[arabianobsession]

Hey people, come on, relax here!

[Jason.MZW20]

Compression ratio is only part of the equation.

Yes, premium fuel is recommended for the 1MZ and 3MZ to get full power from the motor. The ECU runs more timing to take advantage of the higher octane.

With 87 octane, timing is reduced only when spark knock (detonation) occurs. If the engine can't run maximum timing, you lose power as the air/fuel is ignited later in the combustion cycle rather than earlier.

I've logged as high as 48.5 degrees of ignition advance on 91 octane, so the MZ engines do tend to run a lot of timing whenever possible. On engines tuned only for 87 octane, ignition advance is considerably more conservative (20-35 degrees) and is capped so running 91 octane provides no additional power.