My son just bought a 2008 Honda Civic recently, and the oil cap reads 5w-20. I have a good bit of Castrol GTX 5w30 High Mileage that I got cheap, and I was wondering if it would be OK to use it in the Honda. My local Honda parts department has both the Honda A01 and A02 oil filter in stock with included crush washer for $5.99 each, so I am going to buy and use the A01 filter, and my son does plan on changing the oil filter every other oil change as recommended by Honda.