My 86 300E with 233,000 miles developed a lifter tick, could not identify which one as the noise came and went, ran Marvel Myster oil thru the Dino oil with no improvement, changed to REDLINE brand 20/50 synthetic oil and the noise disappeared immediately and has not returned and that was 3 months ago.

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Jerry

2004 SL500 Black 55K Miles
2002 s500 Black 90K Miles
1986 300E Gold 233K Miles
1966 Twin Cessna 320D
1989 Jeep Cherokee 233K Miles
1994 Ford Van E150 399K Miles