Oil Change Indicator

[firebird4u99]

Does the oil change indicator light in our cars measure the amount of miles since its last reset or does it actually measure viscosity of the oil and decide when it needs to be changed ?

[Silver 99 Camaro]

It can't measure viscosity. It uses a formula the engineers derived that uses average engine temperature, RPM, and throttle position to calculate when the theoretical breakdown of your oil occurs. So if you drive all highway and hardly ever punch it, it won't come on till nearly 7500 miles which is the maximum interval. Mine typically comes on around 4500 miles with half highway half city driving and not punching it very much.

[firebird4u99]

Alright thanks for the info [img]smile.gif[/img]