if it is stock compression 93 is fine..where did you find 98 octane anyway?
98
96 + 93 + 98 = 287
no it will not as long as they are both pure gasoline.
Premium unleaded 98 Octane
191
Yes it is just fine to run that. BUT....Why? It will not make your car go faster, cleaner, or last longer than the Regular 87. It is way out of reason to buy the HIGHER 93 when there is Regular available.
NO, it does not... there has been a lot of mis-conception about this topic and being an engineer have been told several times, and have indeed mathematically shown that octane does not affect the efficiency of the engine. the octane rating is simply a rating that shows a fuels resistance to detonation and nothing more. You can confirm this by doing a little research on the Otto cycle (4 stroke standard gas engine) and understanding that when 93/98/87 octane fuel is burned, it releases the same amount of energy. the reason that this myth probably exists, is because higher performance (and higher efficiency) engines use higher compression ratios and have a tendancy to detonate lower octane fuel (knocks). also takes longer for the gas to ignite.
If you're using 91+ octane fuel then theres no point if your car is stock.It IS possible its still knocking even on 91+ but if you're never push your car, no need to worry. If you ARE hard on the throttle, using 93/94 octane would be ideal unless you can get someone or something to scan.?
bad gas get octane booster
As at September 10, 2009. 91 Octane: $1.63 98 Octane: $1.81 Diesel: $1.07
150 octane Avgas (no longer used) 100LL Avgas 98 octane premium leaded (no longer used) 95 octane unleaded 82 octane regular (no longer used) 80 octane Avgas (no longer used)
Cadillac 1958 with the compression ratio of 10.25:1 should not run on gas below 98 octane.