I own a 1993 400SEL, can I use 89 octane gas?
I heard from sombody that, 140 body can use only 91 octane and higher.....is it true?

thanx in advance

 

also where is the location of the fuel filter?

 

the answer to this is simple it will say in your owners manual or inside the fuel door what the reccomended gas for your car is,,, i know on my 99S500 it requires 91 octane... i wouldent run anything else... my guess is your car requires 91 octane,,



the fuel filter is under the car,,, it is roughly in the center of the car inbetween the rear wheels,, a little closer to the front,,, it is hidden behind a large cover that needs to be removed,, but if u look u can see the filter,,,

Mike

 

So why do you want to use 89 RON?
Not a good idea (see previous post) and if its because its cheaper, its a false economy.

To use lower grade fuel the ignition will need to be set to accommodate the grade (to prevent knock / pinking) unless this is done automatically by the engine management ECU. Either way = retarded ignition = less power = less miles to the gallon which will likely MORE THAN offset any potential saving.

Stuart

 

thanx much...

 

If you use a lower grade of gas your knock sensor will pull back the igniton timing so you don't damage the engine. 91 octane is not available in all parts of the world and sometimes you have no choice.

You will see a BIG decrease in power. You could also see a decrease in top speed and passing power.

All in all it is best to stick to what the manafacture recomends. Not only will your car drive as it should but your engine will last longer. Before knock sensors it was not unusual for and engine to be worn out at 80,000 miles. When you took them apart the pistons were broken and crumbling to peices around the top edges.

You disasemble an engine now at 300,000 miles and while the rings may be worn out the pistons look almost untouched. Running the proper octane, and the the knock sensor pulling your timeing back when you can not, is why.

Sam

 

My 420SEL requires 91. Always use the fuel that is recomended in the manual.