TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The film: is monolayer; or comprises many layers. The polyester polymer: is polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate or polyethylene isophthalate; and has an intrinsic viscosity of 0.65-0.75. The carbodiimide hydrolysis stabilizer is a polymeric carbodiimide including an aromatic polycarbodiimide having an amino group directly bonded to an aromatic ring. The UV absorber: has an absorbance peak of 300-340 nm; and is 2,4-bis-biphenyl-6-(2-hydroxy-4-(2-ethyl-hexyloxy)phenyl)-1,3,5-triazine. The biaxially oriented polyester film further comprises: 50-100 ppm of magnesium and/or manganese; and 30-100 ppm of phosphorus. The polyester film: comprises 2-50 wt.% of recycled polyester polymer.. Preferred Method: The method further comprising: forming a masterbatch containing the carbodiimide hydrolysis stabilizer, the UV absorber and the masterbatch carrier; and blending the masterbatch with the polyester polymer prior to extruding the at least one layer containing polyester polymer, where the masterbatch comprises carbodiimide hydrolysis stabilizer (5-50wt.%). The method comprises extruding a single layer or many layers. EXAMPLE - Polyethylene terephthalate (69.6 wt.%), polymeric carbodiimide (0.9 wt.%), 2,4-bis-biphenyl-6-(2-hydroxy-4-(2-ethyl-hexyloxy)phenyl)-1,3,5-triazine (4.5 wt.%), and alumina (20 wt.%) were mixed and dried to less than 100 ppm moisture content, and then extruded at 285 degrees C for the outer layers A. Polyethylene terephthalate (94.6 wt.%), polymeric carbodiimide (0.9 wt.%) and 2,4-bis-biphenyl-6-(2-hydroxy-4-(2-ethyl-hexyloxy)phenyl)-1,3,5-triazine (4.5 wt.%) were mixed and dried to less than 100 ppm moisture content, then extruded at 285 degrees C for the core layer B. These melt streams were then fed through a rectangular joining zone and laminated into a three layer co-extruded A/B/A structure. The resulting melt curtain was quenched on a casting drum at 20 degrees C, oriented in the machine direction (x3.3 at 95 degrees C) with a roller stretcher, then oriented in the traverse direction (x4 at 110 degrees C) and heat-set at 230 degrees C and relaxed (5%) using a chain driven stretcher, and finally wound up to obtain the oriented polyester film.