Hey guys! Hope everyone's doing fine
So today I went for a scheduled maintenance at 5,000 Kms for my Civic (reborn) at Honda Classic. They changed the oil with their own Honda one. They asked for synthetic or non-synthetic, so I went for synthetic. The oil gallon was of 3.7 liters. He poured in 3.5 liters of oil and handed me over the leftover oil. He said that only 3.5 liters is added at 5,000 Kms. But the whole of 3.7 liters will be added at 10,000 Kms. Why is that? :s
And if possible, please compare the advantages and disadvantages of synthetic oil over non-synthetic. Help would be appreciated. Thanks !