Gasoline Octane Change

[CLAVEL3699]

Mga Bro,

Lintek nagtaas nanaman nang gas ngayon pwede ba ako magpalit nang gas.

Ngayon kasi naka velocity ako gusto ko bumalik ulit sa unleaded possible kaya ito.

Please advise para makabalik ulit ako sa unleaded.

Thanks

[ghosthunter]

just use up your current tank of gasoline until near empty then just fill up with unleaded gas... It should not really be a problem if a little of the other kind of gas mixes together since both are unleaded gasoline, just different octane ratings.

[niky]

Should be okay. But if your car is old, you might notice a decrease in performance. But unleaded is moderately high octane anyway.

[OTO]

CLAVEL3699 what's your car? If you downgrade baka masira ang makina mo.

[CLAVEL3699]

Honda Civic LXi po. '97 model po sya

[jim]

Originally posted by OTO
CLAVEL3699 what's your car? If you downgrade baka masira ang makina mo.

curious lang po kung bakit masisira ang makina pag nag-downgrade to a fuel with lower octane. can you please enlighten a gas-hating (dahil sa price) person like me

[OTO]

Changing to regular unleaded shouldnt be a problem. I used to have this thing about putting Blaze in all the cars I drive because it'll make my car more powerful but after reading up about low and high octane gas at http://www.ftc.gov/bcp/conline/pubs/autos/octane.htm made me change my way of thinking.

The figures are a bit confusing concerning the octain rating but dont be. We use the RON system in the Philippines while in the US they use MON/PON. Your car's owner's manual should reflect RON numbers.

[OTO]

Originally posted by jim
curious lang po kung bakit masisira ang makina pag nag-downgrade to a fuel with lower octane. can you please enlighten a gas-hating (dahil sa price) person like me

Better yet I'll just quote it na lang. Local mags and newspapers should do a detailed article on this issue. It would save consumers a lot in the long run.

What are octane ratings?
Octane ratings measure a gasoline's ability to resist engine knock, a rattling or pinging sound that results from premature ignition of the compressed fuel-air mixture in one or more cylinders. Most gas stations offer three octane grades: regular (usually 87 octane), mid-grade (usually 89 octane) and premium (usually 92 or 93). The ratings must be posted on bright yellow stickers on each gasoline pump.

What's the right octane level for your car?
Check your owner's manual to determine the right octane level for your car. Regular octane is recommended for most cars. However, some cars with high compression engines, like sports cars and certain luxury cars, need mid-grade or premium gasoline to prevent knock.

How can you tell if you're using the right octane level?
Listen to your car's engine. If it doesn't knock when you use the recommended octane, you're using the right grade of gasoline.

Will higher octane gasoline clean your engine better?
As a rule, high octane gasoline does not outperform regular octane in preventing engine deposits from forming, in removing them, or in cleaning your car's engine. In fact, the U.S. Environmental Protection Agency requires that all octane grades of all brands of gasoline contain engine cleaning detergent additives to protect against the build-up of harmful levels of engine deposits during the expected life of your car.

Should you ever switch to a higher octane gasoline?
A few car engines may knock or ping - even if you use the recommended octane. If this happens, try switching to the next highest octane grade. In many cases, switching to the mid-grade or premium-grade gasoline will eliminate the knock. If the knocking or pinging continues after one or two fill-ups, you may need a tune-up or some other repair. After that work is done, go back to the lowest octane grade at which your engine runs without knocking.

Is knocking harmful?
Occasional light knocking or pinging won't harm your engine, and doesn't indicate a need for higher octane. But don't ignore severe knocking. A heavy or persistent knock can lead to engine damage.

Is all "premium" or "regular" gasoline the same?
The octane rating of gasoline marked "premium" or "regular" is not consistent across the country. One state may require a minimum octane rating of 92 for all premium gasoline, while another may allow 90 octane to be called premium. To make sure you know what you're buying, check the octane rating on the yellow sticker on the gas pump instead of relying on the name "premium" or "regular."

Source: http://www.ftc.gov/bcp/conline/pubs/autos/octane.htm

[konde]

in my non-expert opinion, la problema yung pagpalit ng gas with lower or different octane rating as long as you meet the minimum octane rating for your ride. 93 grade yata for civics. parang yun nabasa ko sa manual nung 99 vti namin.

[xam]

oo nga eh...gasoline prices are definitely going high :mad: i used to fill up my lancer with shell velocity...but now am just filling it up with unleaded. dito ko rin sa tsikot nabasa na hindi naman pala harmful para sa lancer ko na gumamit ng lower octane gas...

[glntVR]

your car shouldn't have any side effects after being filled up with a slightly lower octane gasoline.

[OTO]

The 98 CR-V could take 91 RON octane unleaded. No one sells 91 here anymore. Sayang pa naman.

[pink_cadillac]

Well it also depends.

I tend to find myself flooring the accellerator more in my old Opel Omega when using lower octane fuel. It ends up costing me more fuel to gain the kind of accelleration required.

Though documented to do fine on 93 Octane, the ECOTEC engine ends up having to gargle more gas to get more power at higher rpms.

[driven]

the best way to save on fuel does not only depend on looking for a cheaper one... i think driving attitude is more important above anything else, diba? like avoiding unnecessary sudden stops, hard acceleration, etc... you can also refer to your car manual, i believe meron nakalagay dun sa may section na nagaadvise on how to care for your engine
doing that will not only save you fuel but also extend engine life. :D

[OTO]

removing unnecessary cargo from the car helps also. weight is a big contributor to bad gas milleage.

[pink_cadillac]

Sudden stops are inevitable in this city.

And folks, driving slow may save you gas, but it doesn't mean you're more efficient or that you do not inconvenience other motorists.

[ghosthunter]

Originally posted by OTO
removing unnecessary cargo from the car helps also. weight is a big contributor to bad gas milleage.

I guess its time to unload that body of Jimmy Hofa from the trunk.

[Walter]

Most new engines have knock sensors, putting gasoline with correct octane level helps in making your engine perform optimally.

It is advisable to check your manual for the minimum octane needed.

CR-Vs need 95 octane and up according to the manual.

[OTO]

i think driving at the speed limit (80/100kph depending where you are) is a good idea even if it isnt enforced.

[OTO]

walter would the cr-vs you are reffering to are the current models?