Oil leak was never an issue when I was using synthetic. The transmission lag was. Owners of cars in colder climate may consider using synthetic for that quick flow during start-up.
Yes Volvo engines especially B230 don't require adding up oil in between oil changes. I figured this is mostly due to its PCV design which recovers oil vapours quite well. My previous Alfa boxer did use up oil - up to 1 litre - in between changes due to oversimplified PCV which sort of free flow in design (valve stem seals and piston rings were ok). But it served the purpose of lowering much crankcase pressure for its high-revving life. This in contrast with our B230 having multi-wall oil separator box. Anyway its a different engine for altogether different driving style.
Regards,
Amarin.
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