Am going to change my head gasket on my 1996 oldsmobile ciera sl, the manuel asking me about Vin "T" and Vin "M". which one do i have?
my vin# is 1G3AJ55M9T6303614. thanks.

For yours it says M for engine and T for model year...I don't know what they're referring to. Here's the website and you can enter your VIN number and it tells you everything about the car. https://www.fleet.ford.com/maintenance/vin_tools/

Thank you, really helps.