Following the introduction of the new 3.0-litre petrol engine, which has replaced the 2.8-litre, two more straight six cylinder engines will join the 2001 model year line-up. A 2.2-litre engine developing 170 bhp and 155lb-ft of torque will replace the six cylinder 2.0-litre in the 5-series (badged 520i) and in the Z3 (Z3 2.2i) and it will also feature in the 3-series in all bodystyles.
And a new 2.5 litre engine developing 192 bhp will replace the existing 170 bhp 2.5-litre unit in both the 3 and 5-Series. Cars will be badged 325i and 525i respectively instead of 323i and 523i.
BMW says both engines are more free-revving and they deliver improved mid-range punch, although fuel economy remains unchanged.
The third new engine is a straight six cylinder 2.5 litre common rail diesel which will feature in the 525d saloon and Touring from October.
Delivering 163 bhp at 4,000 rpm and maximum torque of 258lb-ft at 2,000 rpm, the saloon reaches 62 mph in 8.9 seconds, has a top speed of 136 mph and delivers fuel consumption on the combined cycle of 42.2 mpg. On-the-road prices will be: 525d saloon £26,550, SE £28,095; 525d Touring £28,495, SE £29,995.
The makeover for the 5-series is, says BMW, subtle in a bid to protect residual values of existing models. Changes include redesigned headlights, grille and front spoiler and new C-pillar airbags included whenever rear side airbag options are chosen.