hi u doing guys just need some adivce. i have 01 type r and it turns oil black fairly quickly i will change the oil and 1500 miles it is black. and is down about 1quart down sometimes 1 1/2 quarts. pulls hard still and doesnt feel any slower than before. any thoughts ive researched but people say pistons rings, if that was the problem wouldnt that b hurting my performance. engine has about 90k on it.