giantdismoas Posted October 30, 2004 Report Share Posted October 30, 2004 curious as to what octane rating the newer cadillacs are using. Also, what Octane rating should i put in the 81 eldo? Thanks again Link to comment Share on other sites More sharing options...
Northstar Posted October 30, 2004 Report Share Posted October 30, 2004 I'm using 93 Octane, nothing less. Link to comment Share on other sites More sharing options...
JasonA Posted October 30, 2004 Report Share Posted October 30, 2004 curious as to what octane rating the newer cadillacs are using. Also, what Octane rating should i put in the 81 eldo? The 93-99 Northstar cars recommend 92 octane for best power. The 00-04 FWD Northstar cars recommend 87 octane for best power (more octane will not help in this case). I'm not sure what the RWD Northstar cars advise. It should be in the owner's manual. For that '81, I'm going to guess it recommends 87 octane, as compression ratios weren't exactly "high" in the early 1980s. Jason(2001 STS, White Diamond) "When you turn your car on...does it return the favor?" Link to comment Share on other sites More sharing options...
eldoman95 Posted October 30, 2004 Report Share Posted October 30, 2004 nothing but 93 and a bottle of octane boost, so i run about a 95 Link to comment Share on other sites More sharing options...
bigfoo Posted October 30, 2004 Report Share Posted October 30, 2004 always 93 (shell, aamco, mobil) or 94 sunoco Link to comment Share on other sites More sharing options...
STS Scott Posted October 30, 2004 Report Share Posted October 30, 2004 Actually, my Dad noticed a significant performance increase, between using regular and premium fuel, in his 01 DTS (the latter having the advantage). I believe just because these newer Northstars are able to run fine on regular fuel (due to the computer adjusting the spark), they really come alive when they are able to drink from higher octaines. " ...'took my Cobra down t' the track, hitched to the back o' my Cadillac..." - Jan & Dean, 'hey little cobra' Scott Link to comment Share on other sites More sharing options...
JasonA Posted October 30, 2004 Report Share Posted October 30, 2004 I believe just because these newer Northstars are able to run fine on regular fuel (due to the computer adjusting the spark), they really come alive when they are able to drink from higher octaines. The 93-99 Northstars run fine on regular fuel, because they do retard the spark, but they are optimized for premium fuel. However, the 2000+ engines are optimized for regular fuel, so there should be no spark retardation at that octane. And bbobynski has let us know before that even with an earlier engine, it probably wouldn't even be noticeable anyway (the performance difference). No more than 5 hp difference. Perhaps the regular fuel in your area has some impurities or is "cheap" or something? Jason(2001 STS, White Diamond) "When you turn your car on...does it return the favor?" Link to comment Share on other sites More sharing options...
growe3 Posted October 30, 2004 Report Share Posted October 30, 2004 A higher-octane fuel allows your engine to more fully utilize the ignition advance, to improve power. If your engine can fully utilize its ignition advance with a lower octane fuel, you should not notice any power difference between them. That being said, my 93’ STS’s definitely prefer the higher octane. Although I can run either without any obvious problems, when I am climbing hills you can really tell the deference between them. On the flats the lower octane is fine, until you want to increase your speed at a low rate (not WOT), there is a slightly sluggish feel to the throttle. Using WOT it will still get up and go. -George Drive'em like you own 'em. - ....................04 DTS............................ Link to comment Share on other sites More sharing options...
Ranger Posted October 30, 2004 Report Share Posted October 30, 2004 87 octane, and I have noticed no performance or MPG degredation. Link to comment Share on other sites More sharing options...
norbi Posted October 30, 2004 Report Share Posted October 30, 2004 I my car i have been using only regular gas 87 and i cant complain i guess i am too cheap or just dont have enough money to spend over 2$ for a gallon. Link to comment Share on other sites More sharing options...
Edmundolem Posted October 31, 2004 Report Share Posted October 31, 2004 I user only 97 octane fuel and the performance is optimal 11 km per liter, means 4.6 gallons per mile Link to comment Share on other sites More sharing options...
Cad1 Posted October 31, 2004 Report Share Posted October 31, 2004 Been putting 4gals of 100 per tank w/premium and it took the ping out. 92 Deville w/210k miles Link to comment Share on other sites More sharing options...
growe3 Posted October 31, 2004 Report Share Posted October 31, 2004 I user only 97 octane fuel and the performance is optimal 11 km per liter, means 4.6 gallons per mile At 11 km per L, I think you are closer to 27 MPG. At 4.6 MPG you could only go about 4 miles between filling up. -George Drive'em like you own 'em. - ....................04 DTS............................ Link to comment Share on other sites More sharing options...
growe3 Posted October 31, 2004 Report Share Posted October 31, 2004 I recalced and it looks closer to 25.8 MPG very respectable. Actually just press the MET/ENG button for a English readout. -George Drive'em like you own 'em. - ....................04 DTS............................ Link to comment Share on other sites More sharing options...
epricedright Posted October 31, 2004 Report Share Posted October 31, 2004 I user only 97 octane fuel and the performance is optimal 11 km per liter, means 4.6 gallons per mile huh? Link to comment Share on other sites More sharing options...
vantasticdude Posted October 31, 2004 Report Share Posted October 31, 2004 Some of us will never totally understand that "metric" thing ......am I wrong US gang . Link to comment Share on other sites More sharing options...
epricedright Posted October 31, 2004 Report Share Posted October 31, 2004 Metric...huh...what's metric?... All I know is my lugs are 19mm... Link to comment Share on other sites More sharing options...
Ranger Posted November 1, 2004 Report Share Posted November 1, 2004 Some of us will never totally understand that "metric" thing ......am I wrong US gang . I couldn't agree more and I rensent having it forced upon me without being able to vote on it Link to comment Share on other sites More sharing options...
STS Scott Posted November 1, 2004 Report Share Posted November 1, 2004 Forced upon? Canada is metric, but USA still uses English measurments. How do you mean? " ...'took my Cobra down t' the track, hitched to the back o' my Cadillac..." - Jan & Dean, 'hey little cobra' Scott Link to comment Share on other sites More sharing options...
Ranger Posted November 1, 2004 Report Share Posted November 1, 2004 Have you tried to use an fraction socket recently under your hood? It's all metric. Tire sizes, all metric. Engine bolt threads, all metric. Granted, that is minor but as previously mentioned, I'll never get used to it. Link to comment Share on other sites More sharing options...
adallak Posted November 1, 2004 Report Share Posted November 1, 2004 Canada is metric, but USA still uses English measurments. How do you mean? UK uses metric system as well. Perhaps they are not that "patriotic" and just use a system which is more convenient in any respect. I do not care much of units. Indeed, why centimeters are better than say, inches? But how can one be in love with fractions?! I can imagine what is 19 mm easily, but when it comes to something like 17/64... it is really beyond my imagination, and I have to get a calculator. The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
Ranger Posted November 1, 2004 Report Share Posted November 1, 2004 I guess it's what you were brought up with. I can't argue that metric may be simpler but "old habits die hard" and "you can't teach an old dog new tricks" all are very true. Link to comment Share on other sites More sharing options...
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