regular, midgrade, or premium.

I always wondered what would happen if you put regular or midgrade.


i always use premium 91 octane here

 

93



to scared to put that other stuff in their



ALi

 

I run 91 and use synthetic oil, but my buddy runs 87 and regular oil and his engine runs much smoother than mine at high rpm.

 

93, wouldnt do anything else.

 

95 premium octane.... hell gas is cheaper than water over here.

 

I only use Premium from Shell

 

for me i put in supream if i got the cash and if i dont ill put in regular

 

allways 98octane (sometimes 100octane aral ultimate)for the E500 and EVO 2....

 

....... :/ :\ :/ ...... :/.......

I like, seriously hate you now. What's youre address?


LOL, j.k ... lucky

 

dont mean to hi-jack your thread... but JDW.. did you ever get your hands on a full size spare.... if you need one i have one.. non-bent... PM me if interested

-carino...


as far as gas.... to be honest ive switched a few times between premium 91 octane and mid grade 87 octane... in both my c320 and e320. in all honesty i have not noticed much of a difference in mpg. each tank i also add a bottle of chevron fuel additive.

-carino

 

i use regular and about every 3rd tank or so i use premium. i run a bottle of chevron fuel injector cleaner every few months, about every 8th tank or so.

regular oil. my car is still consuming oil. i add a quart about once a month.


carino
id say that fuel system cleaner in each tank is a little bit over kill. but to each their own.

 

91 is the best we got here in california and i only put it from shell or chevron nowhere else.

 

I use 93, but I did a test and found that if I use 87, my MPG drops the same % of the cost difference between 87 & 93.

IIRC, 93 = 23.4 mpg
87 = 21.1 mpg

 

Premium from Chevron and nothing else.

 

In my 124s I use mid grade for local and flat land driving, buy use Chevron premium in the mountains or out on the super slab like between here and Vegas.

 

premium 91 octane from Chevron only. yum

 

i run regular now...can i just decide to switch to premium or something higher whenever without hurting the car?

Someone told me it wasnt good for it, but I don't think it matters..does it?

 

the highest at whatever gas station i fill up at, usually race trac since it's next to the house

 

race track next to your house???

god...i wish

 

no dude...

not race tracK




race traC

 

Race Trac

 

LOl

 

you can upgrade anytime,the extra cost will be made up by the better mpg.If the engine calls for premium,it will run better,you might not notice it,but under load low grade fuel is probably pinging and you dont even hear it.Funny thing,my brother has one of those toyota matrix,calls for regular,he filled it with high test and picked up 3mpg!so even a low compression motor at times responds to the octane jump.won't work in all cars so no reason to waste the money unless it shows an increase. The benz,most definitly.91 or better

 

ohlord crowned the topic. Ping is the whole deal.

Pre-ignition, detonation, ping - same thing and very bad. Higher octane fuel has a slower burn envelope when ignited. The effect helps prevents ping or the fuel/air mix burning before the crank has advanced to the proper fire point. Premium is a must for any higher compression engine.

Basically, the low grade fuel explosion may occur early (fast burn) where downward force hammers the piston as it rises before it has reached the point in the stroke where it should go down. It makes a clattering sound usually under load like a hill or accelerating. Often mis-read as "valve noise".

Worth killing the engine? The new MINI Cooper requires premium. Posts on a fan site discuss destroying engines running cheap fuel. But they saved money.

 

93 from shell, and keep injector cleaner in the trunk.

honestly, its actually saving money in the long run. 10 dollars extra on gas? or have to a buy a new car in a few years...
worse then buying that new car...

knowing you ruined an old mercs engine