In the last eight months I have bought not one but two decade-old Vauxhall Insignias.

The first one - a 2009 2.0 turbo petrol hatch in range-topping Elite trim - was so impressive I have just bought another. My latest acquisition - a 2010 estate - was an attempt to perfect the formula.

The 2009 car is a hatchback with every extra aside from DAB radio - the latter something I have missed having over the last few years. It was a one-owner car that had washed up in a tiny dealership in a small Yorkshire town.

It rolled on 60-quid-per-corner Chinese tyres and the brake discs were thinner than a dinner plate, but it was an honest low-mileage car with a main dealer service print-out and an interior that looked showroom-fresh.

The 2.0 turbo petrol Insignia is a rare machine, but one I’ve had an eye on since driving one back in 2009. It was a loaner while my long-term Insignia diesel was in for a software update. This petrol Insignia is powered by a 220bhp 2.0T engine equipped with twin balancer shafts. If it sounds familiar, that’s because it’s the same engine used in the Saab Aero models of fond memory.

Coupled with GM’s long-serving and ultra-reliable six-speed slush-box, the car is a quiet, smooth and very nippy way to travel. Smart inside too, with big electric front seats (leather and heated, of course). The heater and ventilation is a strong point as well, and the crash-test rating top-notch.

Of course, there’s plenty in the Insignia’s make-up that was executed by Saab engineers. Indeed, they told me so themselves (though the super-hot heated seats are a give-away). This is, after all, the sister car to the very short-lived Saab 9-5.

The 2009 Insignia was not faultless, but I had bought the 32,000 mile machine for a reasonable £4995. The comedy tyres were junked for Goodyear Vector all-season tyres and the brakes renewed. There was one mechanical fault. One of the VVT solenoids was playing up. A replacement was a reasonable £150.

And therein lies one of the big reasons I’ve gone for a double-hit on Vauxhall: The price of parts was an eye-opener compared to my experience with my other car.

I also have a rare 2010 Mercedes E350 V6 petrol estate. There’s no question it is a fabulous car. But last summer it was clearly not running right, despite being serviced by a Mercedes specialist and getting a clean bill of health. It started emitting a lot of smoke and the exhaust tips looked like they belonged to an old diesel van.