Checking oil

[KillaCam]

I've always checked mine warm after the car has been shut off for about ten minutes.

[KMdef9]

No debate, always check fluids warm. You want to measure at operating temps, not shutdown temps. Now, some fluids can measured with the vehicle running and others cannot.

The only fluids you check cold, are the ones that have a cold level and a hot level on the dip stick or on the reservoir. I.E. Coolant, power steering...