I bought my CF back in November and the oil had just been changed. The seller was using the 0-40w oil and I think next oil change I'll switch to 5-40w. Next oil change is 93,000 miles. I was wrong about how many miles is on my car. It's actually 90,520 and I had confused it with my truck which has 98K miles. Maybe next oil change I'll only go with 1/2 quart of the Marvel Oil. The lifter ticking has gone away with only adding 4 ounces to the oil a couple of weeks ago.