I changed my oil in the supercharger and put in the 10w30 mobil 1 back in. I'm king of glad I did this 10 minute job. The oil had lost most of its viscosity and kind of stank. With 46000 on, I felt it was a cheap insurance move. For the Fish line, syringe and oil it was only 9$ at walfart. If anyone doesn't know how to do this here is the link http://www.stangshiftergaskets.com/2003_2004faqs.htm#_Toc35092327