If you use full synthetic oil in an old mk2, that's not going to work!!! This type of oil will damage your seals (crankshaft, camshaft etc) use only VW approved half-synthetic lube oils...

And for the coolant, if you feel the urge to replace it then I would pick the G12++ Purple/pink colored type. This is also what VW recommended to use in my '85 mk2 gti. With this coolant there's no chance of corrosion anymore. Advantage is that G12++ can be filled up by water!

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Wagenpark:

Golf 2 GTI 8v 1985 (Under Construction)
Golf 2 Avance 1.3 1987 (SOLD)
Passat Sportline 2.0 20V 2002 (SOLD)