...There is no BMW with a V6 engine. You may have confused V6 with Straight-Six.
The BMW 5 series is basically a beefed up version of the BMW 3. The BMW 5 runs on a 6-cylinder V6 or V8, while the BMW 3 has an inline V6 engine. Performance models are even 'beefier' in terms of engine size and horsepower.
The 323i came with the M52 engine, which is a straight-six (not V format).
To my knowledge, no past or current BMW model has ever had a V6 engine. BMW has used V8's, V10's, and even V12's but no V6. However, BMW is thinking of putting a V6 into their new M3 model, since they are downsizing from a V8. They will more likely use a straight six with some sort of turbo I believe.
X5 does not equipped with V6 engine. It's I-6...
No, it is a straight 6 with a double overhead camshaft.
yes the BMW M3 has a V6 but it can have a V8
Just like any other car's engine.
The 525d E39 model had a M57D25 diesel engine, introduced in 2000 till 2003. This was a straight six and not a V configuration.
no
Yes, if you are refuring to the 4.3L V6, Any Small Block GM Transmission will work with this Engine-Transmission combination. Also I do believe the Buick 3.8L V6 will work as well. Any other V6 will not work as a direct bolt in. But anything can be done as long as skill and finance allow.
The 2011 Lincoln MKS has a V6 engine.