I need a suggestion for the best oil to be put into B16A2, I use to put Castrol full synthetic 10-60, I heard it's not that good ? at least not to the B16A2 maybe good for other type of engines.

dont waste your money on synthetic. go with a good conventional. the thicker the better.

Thank you, any good conventional brand you suggest ?

personal preference really. i use valvoline in my d17 and b20.

ive always used mobil 1. i heard of royal purple..

mobil 1..hands down with that one

hands down Redline High Perfomance 5W20. Best on the market. I have use Redline in all my cars and trucks, all of them have run like a top.

10- 60? Thats gotta be like goo. Use the weight that the oil cap says. its probably 5-30. And if you've been using synthetic, I wouldnt go back to dino-****. Just start dumping mobil 1 in it and be done.