Looks to me like the timing cover is leaking oil slowly. Clean it all up because otherwise it will be impossible on this car.

As for coolant, look at the freeze plugs on the block.

158k is not a lot of miles on a 103...but if the head gasket is still original its probably getting close by now.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k