I essentially had the same post a few weeks ago, and I'm sorry but I'm still lost.
I've had my 98 ES for about 3 weeks. I don't know what kind of oil is in it now nor do I know what the previous owner used. Checked the dipstick - came back clean and indicated level was where it should be.
The thing is I want to start using synthetic oil. I don't know which one to use. I don't know if I can just switch to this when I have the oil changed or if some kind of process needs to take place first. I don't know if I'll do damage or something.
I want to start using Mobil 1 - this is synthetic, right?
Sorry to sound so ignorant but I'm trying to learn and I just (for now) don't understand terms like: SAE, viscosity, sockets & gaskets. :(
Help me guys!