Sorry question here from the mechanically challenged: Drain first then swap filter?
Also when checking for leaks should i rev the engine a bit or just let it idle? And how long to test for leakage?
Also do you recommend preloading the filter since its sitting with hole up?
Is there any reason that they can void the warranty for self oil change? (besides making stupid mistake like forgetting the drain plug), I plan to buy filter from dealer.