Synthetic Oil...

You might want to ask one of the major oil companies.

My experience - and that of quite a few other people - is that synthetic oil doesn't harm new rubber parts, but when you switch to it in an engine with old seals that were used with standard oil, you are rolling the dice. Japanese cars seem to be less likely to develop leaks than Volvos, and not all Volvos will develop leaks, but unless you drive an early 850 (these had oil distribution and lifter problems that synthetic oil alleviates), it really isn't, IMO, worth the risk of switching. Volvo engines, especially the "red block" fours, will do just fine on standard oil.

If you just bought a new Volvo, by all means use synthetic.

Or if you have a turbo, the synthetic is known to be less prone to coking up on the shaft, which is one of the primary killers of turbochargers.

Go here, and check out the forums.

This is the last word.... No, but if you have seals that are sealing because of a build up of crud, the synthetic might clean out the crud and you'll leak

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