1. Proud new owner of a 1993 400E with extensive service history. Car has an intermittent lifter tap. Changed oil with 5w-40 syn and added MOA which seemed to help as it is now sporadic. Should I be concerned?
2. What engine temp do the accessory fans turn on at? I know they work with the AC on.
3. Great site .

Isolate errant lifter and check preload.

The lifters in those engines are super hard metal and even ones left tapping for a long time never show any wear on the cam or lifter. You should fix it but you are not in danger of engine damage in the mean time.

I know that Mobil 1 synthetic oils have a reputation for quieting noisy lifters, usually takes several thousand miles of driving.

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC