Are those ''octane booster'' fuel additives safe to use ?

 

Do the manganese deposits from the MMT in them gum up the carburettor

and foul the plugs, as described here ?

 

http://users.imag.net/~lon.trea/TREATalk/Article04.htm

 

 

 

Sure enough, on taking out the plugs, the insulator tips have turned yellowish.

And I am adding in only half of that suggested on the bottle, or just half a bottle

every 60 liters.

 

 

The petrol in Malaysia is currently of questionable quality. Quoted as 95 octane,

but performance is sluggish, engine knocks easliy, and tends to run on after

switching off.

 

My mechanic agrees, saying that this current petrol is actually of worse quality

than the previous generation 92 octane, and seems to be more like 88 octane.

Maybe they have mixed in kerosene or something at the refinery.

How much advance are you running?

 

Yes you can get a yellowish discolouration on the plugs from running octane boosters but I don't think it is from MMT as the ones I have looked at don't list it.

 

One option is to just retard your timing a bit.

Actually I just looked at the MSDS for the one I used to use many many years ago and it states MMT.

 

 

The timing has been retarded as low as I can.

 

It's not the timing, as mentioned. It's the hopeless petrol.

 

Lots of people having the same complaints as I am - dieseling after

switching off, knocking, etc., as I have explained.

 

It's definitely worse than the 92 octane petrol which was preceding it.

 

The yellowishness is from the manganese, I believe. If I had used full

strength, it would have turned reddish-orange.

 

What other better compounds do they have in octane boosters ?

If I use regular unleaded in my 5k it knocks and runs on also. I use premium 95 and sometimes it'll knock depending on the quality of the fuel.

I use 98 where ever possible but I then suffer problem with a rough idle.

It's official fuel is shit, overrated and expensive. Around $1.68 AU for 95ron