Brian Zongkrt, if these specs are right (according by your serial #) 2.5 GHz Core 2 Duo (T9300)
Intro Date: February 26, 2008* Disc Date: January 6, 2009
Order No: MB166LL/A Model No: A1261 (EMC 2199)
Subfamily: Early 2008 Model ID: MacBookPro4,1
Std RAM: 2 GB, 4 GB* Std VRAM: 512 MB
Std Storage: 250, 320 GB* (5400 RPM) Std Optical: 8X DL "SuperDrive"
then the standard RAM: 2 GB, 4 GB * in October, 2008, Apple boosted the standard RAM to 4 GB. Apple officially supports a maximum of 4 GB of RAM but third-parties have been able to upgrade the system to 6 GB of RAM using one 2 GB and one 4 GB memory module. from here. Hope this helps, good luck.