guys do still do the 5,000 kilometer oil change interval? i'll try to stretch this hks sr oil to 10,000 kms this time around before i change it. will be trying liqui-moly engine flush as well. now running at 8k kms the oil still looks ok at not dark at all.

another query, may gumagamit narin ba sa inyo ng aftrmarket na drop-in air filter like hurricane or knn? mas ok ba performance? earlier yung taga parts dept sa toyota sabi niya mas matagal na daw usage ng stock na air cleaner element ng altis up to 40,000 kms na yung maximum usage.