Its a daily driver for work, gets about 30k miles a year all stop and go in Florida, very hot here. Has 170k miles, 2 liter DOHC auto trans. I have been doing 10w30 mobil 1 HM oil and filter every 9k. Is this adequate? Should i go to 10k or lower? It burns and or leaks about 1 quart every 3k. I top off with 10w30 supertech or other cheap dino oil. I do this because I figure the make up oil won't be in there as long as the original oil. No lifter tap or timing chain noises. It has great compression, 180 to 185psi in all 4 last time I checked. I have owned it for 100k miles.