Synthetic oil is fine for an engine, it tends to leak more though if your car is old and the seals are on their way out. For the clutch leak check the master cylinder which is in the front compartment for leaks, also jeck under the dash where the clutch pedal is for leaks as well. If its not that then its the slave cylinder (common Problem) its under the car right on the tranny, If its leaking you need to get a new one.
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