Mine is already 260k. Now using Fully Synthetic 5W40 Mullerol. Change into that a couple of years ago, using FS Idemitsu 5W40 for years but engine vibration getting stronger and stronger. Lose of power a bit even after throttle body wash, etc. A bit fed up.

Since changing to this engine oil, it smoothen the vibration alot. Butter smooth acceleration. Power came back. Never realise just changing an engine oil that is suitable can makes such a big difference. Been using the oil since then. Gave this car a 2nd life extension.

Last time I get good price on Idemitsu (no more) and the mullerol almost double the price. I usually change every 6K (high mileage drive), coz Idemitsu FS seems to be losing properties at 7K, reduced power, etc.

Now due to the double price and the performance of Mullerol, I increase the mileage to 8K and surprisingly for me (after years with Idemitsu), at 8K, it seems to get even smoother and strong. Still I change it out at 8K mileage. I am a sucker for fresh oil to keep engine clean for years.

Have a tracked record of still maintaining engine in tip top conditions for a 20 years, 16 years and 14 years old rides. Spend a lot of car maintenance tho coz I don't drag things out unless pocket empty.

This post has been edited by Cavino: Jul 8 2025, 08:06 AM

Initially used Caltex at the beginning, then later tried with Petronas FS. Engine sounds rougher before i switch to Idemitsu then. Stayed with Idemitsu for years after that. It is only about 1 - 2 years ago before Idemitsu start vibrating. Cannot resolve until I found Mullerol FS. Not only vibrating but loss power.

Cleaned throttle body, have already change fuel injection valve (cost me 1.6K), 3 times in the life of persona usage. Don't know why keep getting dirty. Maybe it's the side effect of Idemitsu FS, not sure but Idemitsu worked well for years.

Anyway, now all ok, super smooth, engine loud as usual but buttery smooth in acceleration.