This would be the perfect time to intstall a pyrometer probe in the exhaust manifold.
Also it would be a good time install a block heater, or replace a damaged one.

PM me if you need a non-EGR intake and exhaust manifold set
I have an extra set from a W116 300SD.

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78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022