Analysis of triglycerides using GC FID.

I have been following up the question asked by Mr. Gaetan regarding triglycerides analysis using HPLC ELSD. We too have been trying to develop a method for triglycerides but on GC FID. The literature suggests use of a cool-on-column injection. Does it really affect the results, in terms of peak shape or reproducbility or accuracy? In case anyone has carried out this analysis on GC FID I want to know which GC model has been used.