snook

iTrader: (5)

I have been using 93 octane in 1996 5 speed sc300 since I got it since that is what the car says on the dash, near the gas cap and in the manual. I figured they really meant it. But I have met other sc300 owners in person that say they use 87.

If I could use 87 without damaging anything I'd like to but it seems to me a good idea to follow the manual.

What do you guys use?

Trevstuh

I use 93 all the time!

SClean4

93 here...i've heard the same that some use 87 but haven't tried it yet...it was when gas was over $4 that it got a lot of buzz

P.R.S.22

iTrader: (6)

Been using 93 since the first day I got the car. Not sure if I really want to find out what happens if I use a lower octane. I don't care how high gas goes.

ZGagnon

iTrader: (7)

94 octane up in canada!

dinhNER

iTrader: (5)

its higher in japan but i wouldnt know anything about it..

twinchy

eff socal we only got 91.. but there is some spots that sell 100 octane though

SC_coupe

The gas cap (and for you Americans, the gauge cluster) says Premium Unleaded Fuel only, so that's all I use. Standard premium here 91 octane, but Sunoco sells 94. I have never really noticed the difference between 91 and 94 in my SC400.

ecstaticSC

iTrader: (3)

I put $20 worth of 87 octane in my car about 2 months ago and the craziest thing happened...












































it drove fine.

IonFeright

iTrader: (-1)

Cant say Ive ever pulled up to a pump and seen 93 octane... 91's the hightest we get out here and thats all I put in.

5sp_jzz30

iTrader: (2)

premium only no matter where i am or what the price of gas is.

i know for a fact that the SC is very prone to oxygen sensor damage and failure. the only correlation i could make over the years was cheap gas.

when i worked at a shop pretty much servicing toyota/lexus products exclusively i did plenty of oxygen sensor replacements on all years and models across the board. i would ask customers some questions. not necessarily to help me fix the problem but also for my personal knowledge and be able to diagnose vehicles better and more efficient in the future.

i have noticed that people that use regular gas all the time are more likely to have o2 sensor failures. it may be a coincidence but i doubt it since it have happened so much. i always use premium in all my cars(sc300, infinity i30, nissan quest, toyota sienna) and i have never had an oxygen sensor related issue...knock on wood

Ryeno

iTrader: (3)

Depending on what brand you use, the premium gas might have better additives in it. Like shell only puts their "v-power" in the best grade of gas. That means its gonna burn cleaner which would explain why the o2 sensors last longer.

Also on MOST cars the higher octane fuel provides better mpg. I know my old 5s-fe camry got a good boost on millage when i accidentally put in 91 octane.

Plus you will have increased power running on 91 (or 93 if your lucky enough to have that) v 87.

2.5tsoarer

iTrader: (3)

I have a map tuned for 87, no need for 93 if you are just cruising.

5sp_jzz30

iTrader: (2)

if we are talking quality gas id say C16 or some ELF F1 gas used by Renault

i tried that elf gas before on a engine dyno on a F3 motor. highly oxygenated out of the box. blew the headgasket

lesson is....dont cheap out on gas.

t70 supra

iTrader: (-4)

i put mid grade in my black car 3 weeks after i got it and my CEL came on due to a FRIED o2 sensor but ran fine and still is