Possibly. If it is like engine oil, sometimes switching to a synthetic will cause a leak to show. The older, thicker fluid may not have been able to get through wherever the leak is now at. However, synthetics will get through and your leaks might show up.
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2006 Mustang GT
1990 LX
GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved)
1998 Contour SVT
Rice Haters Club Member #244
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