I'm currently doing a cleaning on my brothers 02 diamante. I put one bottle of arx in with 15w-40 delo and a supertech filter. Changed the filter at 1500 miles. It's now at about 3300 miles total on the arx because he's too lazy to look and see when it's time to change. I can't really change the oil till this weekend, at which point he'll put another 150 miles on it.....should be fine, no?