3-Series (E46, E90)Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.
Premium gas is the best for all cars. Yes, we know that.
But... your questoin was if Regular would be fine... and, yes
it would also work. Even though you have a bimmer, that
doesn't necessarily mean you need to use premium. It just
means it runs better and lasts alittle longer. All cars were made
to beable to run on regular, because not everybody could afford
or find regular gas wherever they are. BMW's, jags, merc's,
highend cars like that are made so they can go places and
do things other cars can't, and so they can run completly on
regular gas. Peace
__________________ Ford… atleast they circled the problem...
Hey, didn’t they do that with bmw too?...
There’s a difference though...
Ford’s problem is they can’t perform...
Bimmer’s problem is they do it too well!
these engines compress at more that 10:1. indeed they do have knock sensors usually for each cylinder but there are limits on the ignition retardation pre-programmed in the computer injection/ignition map. these programs are based on minimum octane requirements (usually 91 for the u.s. cars) so if you start putting 87 it WILL detonate.
normal flame advance speed is about 40 to 80 m/s (or some goddamn metric unit i cannot remember anymore). low octane can cause inaudible detonation which is usually at about 1000 m/s. this overheats anything that sticks into the combustion chamber, such as plug ceramic or electrodes. plugs can crack and chip, heads warp, all kinds of very bad things happen. also, it will drive like a dog, cos it will not advance timing.
please don't do this to your car...
manufacturers will specify if you can use regular, this is not a conspiracy to get 10c more per gallon out of your pocket.
premium gas is of no advantage for cars that do not need it. as far as i know the detergents are the same regardless of octane rating (prevents valve and more importantly injector nozzle deposits).
in countries where hi octane is not available (these days this is really nowhere, cos third world uses tetraethyl lead) the maps are different or more historically compression ratios are different (by using different pistons, e.g. mercedes still did that in the 80s for the m180 motors).
i had to drive from Maryland to Ohio and back during summer. I had a full tank of 93 octane gas when i left Maryland. I was just about empty when I arrived at Ohio (about 380 miles). Filled her up with 93 in Ohio, spent a few days there. When it was time to return home, I had about half tank of 93 octane left. I filled the rest of the tank with 100 octane. Drove back to Maryland (remember it was 380 miles). I had half a tank left when I got home! So basically, I drove 380 miles in half a tank where as with normal premium a full tank.
Excuse me for being stupid, but the top two gas grades at the local Mobil are 91 and 93 right? Should the BMW be getting 91 or 93 or just 93?
Also, when I buy the car I'm going to obviousl yask the past owner what gas he had been using. If he hasn't been using the proper fuel should I keep using the 87 or should I switch over to the better stuff anyway?
I'm not particularly concerned with the performance aspect, just with whether or not it will reduce reliability significantly.
in my part of the country (md) grades are 87, 89, 93.
i believe that manual states minimum of 91.
regardless of previous owner, use what is recommended. if the owner used regular, i'd consider leak down test to check the head. whetehr there is damage really depends how the car was driven (if it ever been overheated etc...)
I always go for as high octane as is available because the engine runs smoother, you feel greater power output and the engine doesn't struggle as much as well as all of the other obvious reasons already stated,,,, in the US, particularly in Southern Cal where I live, there's only 91 available, in Bangkok, where I live/work and bought my BMW 323i, the manual stated no less then 95 octane. Thailand used to have fuel no lower than 93 and as high as 97 for pretty much the same prices they have in LA, now they don't have anything higher than 95 so I guess I'm a little lucky, the lowest is now 92 here but it depends on the gas station
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