Hi All,

I currently driving the proton saga Iswara 2007( orange color model).

3 weeks ago, i had some issue when i drove my car. It jerks terribly when it hits 3000rpm at 2nd gear. Since its near the time for me to do my periodic maintenance, i send for maintenance. During the check up, the mechanics found out that its time to change my spark plug as it's filled with carbons deposit. At the same time, i also change the cable for the spark plug and did some maintenance here and there.

Then the mechanic asked me, what petrol i'm using. I told him I'm using Ron95 with some adjustment to the timing. He told me that my car, according to the manual, it is suppose to run on Ron 97. And when i change to Ron 95, the maintenance cost over long period will be higher as the Ron95 will effects my car performance and conditions (i think he is talking about Ron 95 is not good for the engine etc..).

He suggested i changed back to Ron 97. I did do that but the petrol price recently jsut hike up again.

So, my question is that, 1)Does using ron 95 really that bad for the engine?

I'm not sure how to compare the cost wise for different grade of fuel but basicly, 2) is it true when he says the maintenance cost will be higher and its much more worthwhile to pay for the higher fuel cost for Ron97?

Appreciate your comments.

THanks. I've read the website earlier when i changed to ron 95 last year. It just that since i got this problem and the comments from the mechanics, i wasn't so convinced with the article from paultan anymore for this matter.

That's why i'm wish to gather some advice/comments from anyone else here whether they had experienced this during their maintenance and can advice based on their experience.

T_T sudah pump 3 times full tank for Ron 97. i guess i will change back.

Anyway, in that case, is the process below proper?
1)pump Full tank Ron95 when low fuel and the fuel light is blinking
2)Use the car for a few days.
3)Go for tuning the ignition timing.


On a side note, i was searching for the fuel consumption (KM/Litre) on Ron95 vs Ron97 for this iswara. Didn't manage to find yet. Any help on this?

Thanks a lot~!

T_T Nope. I was con into changing back to Ron97 about 3 to 4 weeks ago by my mechanic. lol

Ok ok. Guess that is good to change.

My fren told me to pump the petrol 2 times full tank before go for tuning. This is to really reduce the Ron97 quantity for tuning.