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A few questions about turbocharging...

Hi, I have a few related questions please about turbo petrol cars. I'm thinking of changing my car soon and might actually go for petrol over diesel this time, mainly due to cheaper purchase price and reliability concerns about diesel cars when warranty runs out.

Do modern turbo petrol cars typically have EGR valves and Dual Mass Flywheels, two parts that often cause problems in diesel cars? Also most turbo petrols of today don't have particle filters, do they?

Final question please: why, if petrol is meant to have more potent power than diesel in many ways and I know petrols can generally manage higher revs and top speeds than diesels, do turbo petrol cars usually have much less torque/pulling power figures than equivalent sized turbo diesel engines? I've found diesels to have much more pulling power and responsiveness at speeds that are actually legal and under the limit, than petrols, in cars I've driven. Why is this when both types have turbos?

K Holden, Waterford.

Does the 5 Series have suspension problems?

Can you tell me if owners of the F10 BMW 520d have had suspension problems? The rear spring has broken on my 2012 520d with 50,000 miles on the clock. No tow bar, pothole or apparent tyre damage. BMW fixed it but it is not a recall.

Any views?