SC400SAIF

I got a 92' sc400 and I always put premium. even if I got to put premium and order off the dollar menu for lunch. I'll do it(talk about dedication huh? lol). Is it really necessary to put premium? Could I put reg and a fuel booster?

Hil

iTrader: (61)

It's not that much more... I always get premium

BostonSC4

iTrader: (2)

My car deserves better than regular or mid grade. And she gets it. Every time.

Kohinoor

iTrader: (22)

you wont pay maybe 10% more for premium, but youll pay for fuel additives? doesnt make sense

jadu

iTrader: (42)

no choice for 91, that's the highest we's got

BostonSC4

iTrader: (2)

No choice for 93, thats the highest we use over here.

ashtray

iTrader: (12)

well octane ratings vary from state to state I think...but I always just get the best there is dont even think twice about it. Its second nature. Its instinct.

BostonSC4

iTrader: (2)

My thoughts exactly.

aka paco

iTrader: (15)

93 octane here.. and i'm paticular about what gas stations i go to as well.. might be different for other area's but i normally stick to , BP, 76, Shell, Mobil..

It would be nice to buy cheap gas for once, but 93 is only a few bucks more per fill up..

Photon440

iTrader: (3)

I usually use Chevron's premium, which is 94. For awhile I was gassing up at Husky, they had 94 premium and 90 regular, so I alternated every half a tank. But their regular has gone back down to 87 now, so I don't do that any more.

-=Photon=-

CSSC400STL

i use to use regular: egads: but now after a few mods i run nuthn but 93 octane. gas is to much for real but u have to give her the best lol: thumbup:

saurah

iTrader: (7)

I give ampm quality, or whatevers cheap... arco mainly. I don't care about this motor. Cold start slapping revs out of the driveway.

Klaus

iTrader: (1)

Octane has nothing to do with quality. 87 octane is just as good of quality as 91 octane. The difference is in resistance to detonation. During the compression stage in a 4 stroke motor the mass of the air/fuel mixture stays the same while the volume is decreased therefore the temperature of the mixture rises according to Boyl's law. If the air/fuel mixture reaches the heat of combustion prior to the spark plug igniting, the mixture will detonate (hence detonation).

87 octane is typically safe on engines up to around 9:1 compression. 91 is the minimum recommendation for motors over 10:1 compression as the A/F mixture will become hotter on a 10:1 motor during the compression cycle vs a 9:1 motor. 91 octane has a higher heat of combustion than 87. This is not to say your motor will definitely detonate with 87, but under the right conditions it could. 91 it's far less likely.

Cliffs- use 91 octane on our motors that range from 10:1-10:5 compression depending on year

TLDriver

iTrader: (4)

for 16 gallons from reg to premium the difference is $1.60, I can go a day without a coffee.

96SC4

iTrader: (2)

lol
93... literally, it's a couple dollars more per fill-up