Shifted from Shell to ZIC in 2010. Since then never looked back. Have been using OW in different cars.
First 5000Km oil change in all cars had exactly similar effect:
- Smoother ignition
- Better/Smoother engine sound
- Increased performance
- Slightly improved mileage
For a year or so, I changed the oil every 5000Kms. But Since 2012 I have been changing it at 7000 to 9000Km without any issues of any kind. ZIC SK is aware of my oil changing habits. But they always tell me not to tell other people to do the same as it affects their sales.
I prefer OW for various reasons, the biggest one being it's viscosity at cold starts. Mostly our cars in the city are used for short hops and very short hops, involving many cold starts through out the day.
After reading enough about the SAE grades over the years, 0w-30 rating of ZIC OW best suits my needs.
Drive Safe & Sensibly