can i use 87, 89, or 93, which is the right kind for my engine?

 

87 the ls doesnt merrit premium

 

Well in CA, the highest octane is 91 which sucks but that is what I use in my B16, which is the minimum requirments, but I wouldn't use the cheapest gas, atleast 89

 

An LS will not benefit from the higher octane. With gas prices being the way they are, the bare minimum is fine.

If you had a vtec motor, you must put premium in.

 

Damn. I've been putting chevron 91 in like it was free. Have I been wasting cash all this time?

 

Well it depends actually IMO anyway

Because 2 weeks ago in SF 91 was like 2.99 a gallon and 87 was 2.79, so calculate 20 cents times 9-10 gallons thats roughly a lil more than 2-3 bucks more and u get 91 octane

But if u like to hold on to ur wallet and dont need the 91 octane then 2-3 bucks are saved

Speaking of 91, i heard that since the B18b doesnt need it, putting 91 actually can hurt ur motor, i doubt its true, but my friend suggested otherwise...dunno

 

if you have an ls with stock timing then you will not benefit with anything above 87(or whatever regular unleaded is in your area)

if you've advanced your timing, you should move up to 91 or so, or else youll start to knock

 

thanks. wow, $2.79 for 89oct. its like $2.39 in Va

 

Keep 89 in there. A higher octane can cause detonation in the cylinders under high duress which can be a detriment to the performance. However, in a VTEC motor, the octane level that just prevents knock is what you want. This can vary depending on your elevation from sea level and moisture in the air. Using too low an octane level can cause the knock sensor to prevent VTEC from enaging. Using too high an octane can cause said detonation (premature firing of the cylinder due to too high of compression).

 

gas just went up today, i spoke to soon. $2.99 for 89 octane