ratm_66 Posted April 8, 2003 Share Posted April 8, 2003 I'm about to buy a 1993 gs300 and i'm wondering what octane gas is recommended and what octane does everyone here use. If it's recommened to use 91 or higher can you put in 87 octane or will that ruin the engine?thanks P.S.- I'm a poor college student if your wondeering why i'm so cheap;) Quote Link to comment Share on other sites More sharing options...
income247 Posted April 9, 2003 Share Posted April 9, 2003 Hello ratm_66 ~ Don't buy a car you can't afford to maintain. 91 octane or it will run like $hit. Quote Link to comment Share on other sites More sharing options...
zeta Posted April 10, 2003 Share Posted April 10, 2003 the suggested is premium grade fuel because it is a premium car and it probably cost you quite a pretty penny. but if you put 87 into the engine, the engine will not respond as well and a few factors such as gas mileage will go down. so in the end, with the extra gas you need to put in becasue of the lower gas mileage, you might as well get the premium and go with higher gas mileage and a better maintained car. if it's going to be a brand new GS, i would say go with somethin else if you can't afford the higher premium gas. Quote Link to comment Share on other sites More sharing options...
Rodders Posted April 11, 2003 Share Posted April 11, 2003 I'm with Zeta - my GS notices big time if I put cheapo fuel into it Quote Link to comment Share on other sites More sharing options...
mylesaway Posted August 12, 2005 Share Posted August 12, 2005 i also have a 93 gs and when i put the cheap gas in it you can feel and hear the difference. Quote Link to comment Share on other sites More sharing options...
TurboGS300 Posted August 12, 2005 Share Posted August 12, 2005 i also have a 93 gs and when i put the cheap gas in it you can feel and hear the difference. ← There the gas you're using is really cheap, you'll have to go up to the next octane level <_< Quote Link to comment Share on other sites More sharing options...
lxs300g Posted June 26, 2007 Share Posted June 26, 2007 If you start getting knocking noises then use 91 octane. It is recommended but not written in stone. if you do go with 87 and hear knocking, go back to 91. And income247, he did not ask you for an opinion about his money not being able to maintain his car. Wise as nothing.:) Quote Link to comment Share on other sites More sharing options...
snx37 Posted July 2, 2007 Share Posted July 2, 2007 If you start getting knocking noises then use 91 octane. It is recommended but not written in stone. if you do go with 87 and hear knocking, go back to 91. And income247, he did not ask you for an opinion about his money not being able to maintain his car. Wise as nothing.:) Actually, that's not what would happen. The engine will not knock using the lower octane fuel, but the timing will !Removed!, which will decrease performance. (And I personally think the admonition to not buy a car that one can't afford to maintain to be very sound advice. If a person is on so tight a budget as to not be able to afford premium fuel, they're not likely to be able to afford the required periodic maintenance, let alone any repairs that might come up.) Quote Link to comment Share on other sites More sharing options...
Witty38 Posted August 2, 2007 Share Posted August 2, 2007 In my 1994 GS300, I use 89 octane and add a fuel reformulator called ETHOS. Been doing that for about a year. NO knocking. great performance. Just had a smog check in California today and the technician said the engine is so clean, I could do open surgery in it! Quote Link to comment Share on other sites More sharing options...
dssnosher Posted August 2, 2007 Share Posted August 2, 2007 In my 1994 GS300, I use 89 octane and add a fuel reformulator called ETHOS. Been doing that for about a year. NO knocking. great performance. Just had a smog check in California today and the technician said the engine is so clean, I could do open surgery in it! My '98 GS400 has "finger" knocking noises when fueling with 91, it disappears when i put in 94 from Sunoco Quote Link to comment Share on other sites More sharing options...
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