About 6 months ago a friend of mine bought a new Honda Civic. Shortly after he bought this car, he told me he was going to use Mobil 1 full syn and Mobil 1 filters and change his oil and filter every 3K miles. I wanted to tell him to send me the oil every time he drained it because it will still be good, but I didn't want to sound rude. How do I explain to this guy that if he changes his oil and filter this often he could use the cheapest oil and filters out there and never have any oil related problems without making him feel like a dumba$$?