Bill is 100% correct. Also, it is a myth that after converting to synthetic new seal leaks will develop. The worst that might happen is that the seal(s) that are already leaking might temporarily leak more. This happens because synthetic oil cleans the seals of gunk (oil gunk can help a seal a leaky seal) possibly causing a little more leaking. Long term synthetic can rejuvenate the seal (if not blown out) and the leak can eventually disappear.
Synthetic is also good in trannies and PS systems. For example: The rack in my 95 850 was leaking. After converting to Mobil 1 synthetic the leak stopped in about a month…:)
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Will I buy another Volvo??? We'll see....
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