When I bought my S70 T5, It had 37,000 miles on it, and had always been serviced by our local Volvo dealer, who used Castrol Syntec since new. Since I’m an Amsoil guy, of course I changed the oil as soon as I got the car. I used the Amsoil engine flush, and filled the motor with 100% synthetic 10W-30. I was shocked. For the first 1000 miles, I burned almost 1 quart of oil. After that, oil consumption ceased; I haven’t had to add a drop in the last 5,000 miles. This is a very interesting phenomenon. I’ve heard of this, but until now, hadn’t actually experienced it.

On another note, When I switched my Jeep Grand Cherokee over to Amsoil at about 50,000 miles, I first drained the oil, then changed the filter (to a cheap filter), installed new conventional oil with the Amsoil Engine Flush. Did the flush, and was amazed at how much gunk was flushed out of the motor. My newly installed cheap conventional oil looked like it had 5000 miles on it within 20 minutes! I then proceeded to drain the oil, and switched to Amsoil oil and a new SDF filter.