I change out RFT after a few months from collection as they are really not comfortable.
This could be the reason. For EO, you will need to change the engine seal and/or the oil filter housing at about 50+K mileage (You can smell oil burning in the cabin when you start your car cos it will leak onto your exos man). As for consumption of EO, I don't think so. But that's for engines under 100k mileage. I do not have experience or knowledge with those >100k. If you read at some of the stories with buying 2nd hand car on 2nd COE or those who renewed their COE, they do spend some money bringing the car back to useful life, including light engine work.
OIC...then do u carry a tyre kit with you in the car since the car doesn't come with it? or just rely on third party to rescue u in the event of a puncture?