Second service

I took the car to the Eneos service center in 1 Utama on Monday morning for a regular service and a car wash too. Both together cost me about RM 140. This time, I opted for the synthetic blended oil with grade of 5W-30 instead of the fully synthetic oil that I opted previously.

Wait a minute, fully synthetic engine oil? Isn't those would last for about 10,000Km? So why am I took it to service after only about 5,000 Km? Yup, I was told by my friends who's into car that fully synthetic engine oil could actually lasted for 10,000 Km. But the technician from Eneos told me it's not recommended to do so, so I just took that advice.

1 thing I did observed after driving for more than 5,000 Km with the fully synthetic oil; I found that the car started to response badly - more shaky when it's idle with D engaged, and could feel power is not delivered. Then I checked the engine oil and it started to turn pretty dark, so I opted to take it to refresh it's engine oil.

I wonder, what would determine whether a car with a fully synthetic oil could drive for at least 10,000 Km? Does it includes calculation such as driving up hill most of the time that would require more engine power? Would those actually effect the mileage? I wonder...