Quote Originally Posted by nickel68 View Post
Guys,
Any effect ba sa engine kung nagpapagasolina (unleaded for my corolla 97) not in one gas station...Petron...Shell...please i need your comments on this. Salamat Po.
Generally there would be no effect to your engine unless the engine has be tuned to deliver higher levels of performance above factory ratings. The only things to look out for is gasoline stations with dirty or contaminated fuel tanks.

Contaminated fuel tanks would have some amount of water mixed with the gasoline. Dirty gasoline is caused by the gasoline station pumping from an almost empty storage tank, sucking up the muck from the bottom of the tank.