Just sent my car for its scheduled service recently, and decided to ignore Proton Service centers altogether as my car's warranty has expired, and they charge cut-throat prices.
First, bought Shell Engine Oil Flush at a Shell gas station for RM25 /4liters. Then drained the old oil and poured the flush in. After 5 minutes, drained the flushing oil and voila!.. look at the photo below:
After replacing the oil filter and pouring in the Motul 6100 Synergie+ Semi-synthetic 10W 40, the engine runs really quiet and revs really smoothly !!! Its so different from my previous experience with the Petronas Syntium 800 Semi-synthetics....
With the Syntium, the engine sounds course after revving past 4500 rpms, but now with Motul, its sounding really great all the way till 6500 rpms!!!
I love revving the engine now.... sounds great ! There goes my fuel economy :)