lol i take no offence. I am on a few classic camaro forums and see a lot of almost obvious questions get asked time and time again. And i am in love with this car, i only want to treat her right!

 

Is there any additive available to bring 93 octane up to 95?

 

What vehicle do you need 95 for?

 

If gas mileage is a major issue then maybe not the right type of car. IMHO

 

Not that I mind spending more for premium and not that it is like this everywhere, but the difference in price around here is a heck of a lot more than 15 cents. Just last night I went to a Shell station, 87 was 3.249, 89 was 3.499 & 93 was 3.749. That's more like $12.50 per tank fill up...

 

Just buy premium and enjoy

 

detonation can take out a piston...

 

The cars have knock sensors that retard the ignition so that detonation does not occur. The result is less power and increased fuel consumption, but only while the knock sensor is actually doing something, most likely less than 5% of driving.

 

 

 

That's engine damage, not "wear out" . There's a difference :-)

Cheers
DD

 

That's what I do.

However, buying premium because we enjoy buying premium does not magically make true the myths and misunderstanding about high octane fuel :-)

Cheers
DD

 

you'd be suprised what people this is "worn out" VS "damaged"

 

Yeah, probably true....but I've gone back and read all the postings and can't find anyone who says it's a "major issue" for them.


Cheers
DD

 

Was not intended for anyone here was a basic opinion

 

I think I get the gist of what you're trying to say.

I agree that some people interpret things differently. Most people, though, would not hold a burned, melted piston in their hand and say "See, the darn thing just wore out" :-)

My question stems from a couple people remarking that increased wear and tear would result from the use of a lower octane fuel. I'm just asking for examples so we can discuss them :-)

Cheers
DD

 

Here in the UK we can buy 95 or 97 octane. I believe the standard is different to the USA. Here it is called RON (Research Octane Number). What is the US standard, and the numbers equivalent to ours ?

FWIW the UK "Super" is about 6-8 pence a litre more than "Regular". I filled up with it once by mistake, (from nearly empty right up to full). It seems to give slightly better fuel consumption, but not enough to offset the extra price.

 

See post #11 above.

 

I don't think you have too much to apologize for, BMW. I pretty much will back you up on all your comments.......well, actually I may have to take exception to the premature part wear thing; I might be able to give you some spark plug wear, but that's about it.

If they designed it for premium.......feed it premium, that's my take. In the big picture, the cost difference is insignificant.

Likewise, kudos to the OP for having the courage to ask.

Cheers,

 

If your ride has computer controls, then the computer makes adjustments to make up for this. With variable cam timing, the intake valve closing is retarded to make your dynamic compression ratio drop down to around 8 to 1.

Knock can also come from pre-ignition which isn't controled by the spark timing.

Remember, your computer will be trying to advance the cam timing for more low end power and then the knock sensors will cause it to retard the timing. This will go back and forth and it isn't so swell for the motor.