I think you're getting confuse that 0W and 5W cold viscosity means both will start cold at their respective sub-zero temperature. What the number indicates is 0W can go over -35C while 5W can go up to 30C pour point. Both will remain fluid for easier engine start at subzero temperature.

However our temperature practically never go below 20C, so 0W to 20W have practically same cold start performance at the temperature.

What you have to watch out is extending the mileage. The bigger the difference in hot and cold viscosity, the more addictives and viscosity improver (VI) are used. Ie 0W40 had way more addictives and VI vs 15W40. Addictives and VI breaks down way faster than the oil itself. So when addictives wears out, the oil will not remain in grade meaning, if the base stock is actually a 30 weighted oil and VI is used to increase / decrease viscosity, losing addictives will mean the oil are unable to lower it viscosity to needed cold start or thicken them to 40 weight. It will start to stay at weight 30 only and thats not good for the engine.

True FS base VI without addictives is very high already. So even when losing some addictives, it will still remain in grade near its natural wide VI range rather than the artificial VI addictives. FS natural VI does not break down fast vs addictive VI that breaks down very easily. Our group 3+ VS has higher natural VI than mineral and semi thus its VII breaks down slower than mineral and semi. Thats why some try to extend the mileage. Unfortunately its still not true FS thus the addictives and VI will still breaks down as same rate as mineral/semi. Just that these FS will lessen damage to engine vs mineral/semi at same mileage. Still damage will be done if extend too long thus recommended change at 5K before any chances of VI truly wearing off.

You really the Oil Man here, every time any one mention about oil sure you apear to reply,,,,,,salut bro   ....just like stanby here 24/7 to answer anyting about oil...are you working or buisness at oil related company ?

how mcuh it cost and when launching oh?dunno proton will launch the package to BOT for our PE or not

Try CC5 

can..alot of campro engine BOT at xenonsport ady..quite reliable..can get around 170whp for stage 1 without change piston and block..stage 2 not suit for auto,bcoz too high horsepower..around can get 220-240whp for stage 2..

How long you been using CC5?
Many shop recommend me to use CC5..
Currently got promotion RM 240 per pcs