Yes, you can mix them.
Yes
1 quart and a half
what is half a quart
A half quart is equal to 16 ounces.
Quart and a half Quart and a half
it will hold about a half quart of oil
Four quarts give or take about half a quart, if it has Vtec it will take a little more oil about quarter to half a quart depending on the size of the engine. 1.8L B18B1
1 pint is half a quart, and half is 50%.
The crank case holds 3 quarts. If synthetic is in bike now you have to put synthetic back. Replacing synthetic with conventional oil does something to the gaskets and seals and causes leaks. You can use a top name brand 20-50 from parts house or Wal-Mart such as Mobil1 for about half the cost of HD or Amsoil. You should be able to get filter from other source than dealer too.
a quart is 1/4 of a gallon so it would be half of a gallon of milk then a half of that half
there are 946.352946 mL in one quart, so there are 473.176473 mL in half a quart
A Liquid Quart is 4 cups so "one half quart" is 2 cups.