Attached is a report of a sample taken from my 500SL. This car is a 1991 and has been in the family since new. It only has 54K miles and only gets driven about 2K a year. This oil has been in the car for 14 months, and I was concerned because I spoke to Dave at Redline and he said to change it after a year. At $11 a quart and a capacity of 8.5 quarts, I have decided that after this one run with Redline to go back to Mobil 1 0W-40 and change it every other year.