Yes, and it is in your mannual.
5W20. I would choose a good-quality synthetic - Mobil 1, probably.
The OEM recommended oil weight for a 1990 Honda Accord is 5w 30. There are other alternatives such as synthetic which can offer more benefits and a longer life span to an engine if used correctly.
Yes, you can use synthetic, conventional, or a mix of the two.
The manufacturer of the 1995 Honda Accord recommends 10W-30 weight motor oil. A heavier motor oil can be used in extreme climates.
Your engine will be protected and you can extend the change interval by around 2,000 miles. Other than that nothing will happen. You can even mix synthetic with conventional oil.
5W20 synthetic.
Yes, and you can even mix it with conventional oil.
Via the dipstick
That is a personal choice as to Synthetic vs Conventional, if I'm not mistaken it calls for an SAE 5W30. If the engine has NO Major Oil leaks then I would use a Synthetic Motor Oil 5W30 or even a 0W30. Hope this Helps.
Can you? Sure you can. Should you? No, you should not. The recommended weight oil for a 1997 Honda Accord is SAE 5w30. Use only that weight in conventional or synthetic.
SAE 5w-20 any major brand conventional or synthetic oil.