I have 2000 Corolla CE trim, I bought this car about a year ago, I've been putting 5W-30 high mileage oil so far since.
I do my own oil change every 3000 miles as people says on internet. (Not sure its too short)
Some of my friends telling me that Synthetic oil would make the engine lasts longer and some other friends telling me its always better to be stick with what I have been adding, which is high mileage oil.
I do not have any information that regards what kind of oil the previous owner have been adding, since I got it from private dealer. I do having trouble with losing oil. I believe its common for old car but I need to add about 1qt. every 2 weeks to be stable on engine oil. Should I add thicker oil? Is that the solution?
Please help me to give the best treatment for my car, should I stick with the kind of oil that I've been adding?
And is there a way to prevent oil loss? Would the thicker oil will last longer but not harm to the engine?