Said car is a 1986 300D Euro model with the NA 603. Although the oil was just changed 300 miles ago with Shell Rotella 15W-40, it was still pretty black. And one of the lifters at idle was quite noisy.

So my buddy and I flushed the oil TWICE this morning. First time, we filled it with 5.5 quarts of 15W-40 Shell Rotella and 2 quarts of ATF leaving the oil filter unchanged. We then drove it for 15 miles.

We then flushed it a second time, this time using 7.5 quarts of Shell Rotella 5W-40 synthetic and changed the filter. After a 60 mile trip home, the oil still has nice golden color and my lifter noise is completely gone!!

Just thought I would share on what worked to cure my the dreaded lifter "tick" and improve my oil quality.

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Mike

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