How much do a service history affect the value of a car?

[Dumb and Dumber]

Hi guys, I just want to get some indication.
Lets talk about a specific car to get an indication. Lets take a BMW 320i, 2000 model.
If you have one with a full service record, and one without. Both are in the same condition. About how much less can you expect to get as a trade-in for the one that has no service record?
Also, when buying, how much less will you pay for the one without the service history?

 

[darrylo]

 

[rodga]

 

[Schmuck]

 

[TimbaLand]

 

[Schmuck]

 

[Supergrand]

 

[Dumb and Dumber]

 

[Henry]

 

[user 997]

 

[reactor_sa]

 

[Henry]

 

[reactor_sa]

 

[Dumb and Dumber]

 

[Henry]

 

[mafioso]

 

[reactor_sa]

 

[Dumb and Dumber]

 

[Henry]

 

[ron g]