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Bukit Timah this early morning was <i>totally out</i> of Formula 98. So I thought why not try V-power. Wow. Ok, not a big wow, but there's an increase in responsiveness from the engine. Not drastic either, but significant enough to feel it running better.

And this blue fuel gives out a funny smell too.....

Is Fprmula 95 v bad for the engine? how about Esso/mobil 5000?

Formula 95 has an octane rating of 95. Octane is the <b>compressibility</b> of the petrol - just how much it can be squeezed in the piston chamber before igniting by spark plug. A higher rating means more compressible, in turn meaning more can be injected into chamber, and thus more power upon combustion.

Check the octane rating of your vehicle's engine - using too high a rating is actually kinda wasteful ;-)

PS - Diesel has a fixed compression ratio, so it will auto-explode once you over-compress. Which is how diesel engines work - no spark plug.

nope.. i dun think that 95 is bad for the engine. If u look over at other countries eg Japan, their cars are actually using 95 and lower besides, the engine ecu is configured to be optimal using 95 fuel.

98 and Vpower r juz like some premium petrol which ur car doesn't really require at all. FYI, i was initially using 98 for my car, but recently switched over to 95 and the mileage which i can get on my car is none the worst!! Infact, i have been getting the same distance if not more using 95.

Appetite wrote:

i have been getting the same distance if not more using 95.

I reckon fuel consumption only increases when your engine pistons are specifically designed to take in more (of the high octane fuel) and compress at a higher ratio.

nope.. that is not true. The ECU is the one which is like the brain of the vehicle which knows what are the correct mixes which we ensure that the car is running at optimal!!

just remember that ppl pay alot of $$ for their car to be tuned correctly so that they can get the best performance out from the car's other performance addons :)

Ah, so compression ratio is something <i>programmable</i> and <i>variable</i> now eh? Well I'm not surprised, but that's definitely a good move by the engine engineers. Now how does one (owner) actually tweak such settings?

sure we can do it.. all we need to buy the program which are able to tap into the ecu and from there.. FTFM and figure out which are the settings 2 tune.

Usually amateurs like us dun do such stuff for setting the wrong stuff might result in blown engines!!!

whey how can compression be variable? steady mighty morphing pistons? cannot la no way. and japan does not use crap petrol man, they have 98 and 100 grades. if your engine is a high comression one usually will require higher octane petrol for better combustion.

valve and cam timing and lift can change on the fly electronically but not compression.

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Can the deer defeat the wolf? ~ Manfred von Richthofen

fiftheenhundred wrote:

valve and cam timing and lift can change on the fly electronically but not compression.

Doesn't lift translate to compression? The higher you push the piston up the greater the compression.

hmmm cam lift changes, not the pistons. not sure if pistons go up ,higher compression will change. since the stroke remains unchanged. gotta ask the honda junkies. if i'm not wrong, if the cam lift changes the vavles open for a longer intake time.

i'm not a variable lift fan...

AND SCUM you changed my signature! hhahaha! cool!

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Can the deer defeat the wolf? ~ Manfred von Richthofen

fiftheenhundred wrote:

AND SCUM you changed my signature! hhahaha! cool!

It is but befitting 0:-)

So in summary, will (% actually spoil my engine if I use it long term?

If you use the correct rating (not lower) I don't see why you should fear long-term engine damage. You could inspect your engine block and pistons for evidence of residue.