Switching over to synthetic at this point in your car's life, you may want to check the oil a lot until you're sure it isn't running lower and lower. I know @ 75K I switched to synthetic on my SVT, and I must have had "not so great" piston rings because I was running lower and lower fairly fast. Then, when I was not even 1 quart low..... I took a right hand turn and ::CLICK CLICK CLICK CLICK....::
2005 Ford F150 SuperCab FX4
1964 Chevrolet Impala SS
1998 CSVT: 354HP/328TQ @ 10 psi, now gone
