Change oil light

[efnfast]

Does my '90' have the ability to calculate when the oil needs to be changed, or does the light come on at a certain mileage. As a side note, it turned itself back off. TIA. - Steve

[Kevin]

i'm 99% sure it's mileage based.

[VetteMed]

Not mileage based - it's a rev counter, basically. There's a complex algorithm based on number of engine revolutions, and oil temperature, and possibly some other parameters.

[efnfast]

VetteMed, they could do that in 90 with OBD I? And, why did it go back out. Maybe it assumed I always drove like a nut and, well, I guess I always do.

[VetteMed]

Yep, as long as there's a crank position sensor, the number of revs can be monitored.

Not sure why it would have gone out, though. That's odd to me.

[efnfast]

Does it normally come on with "key on"? Maybe it goes out after a certain number of key starts? Seems unlikely. Maybe the bulb poped.

[scottfab]

To check for popped light just turn the key on.
The dash lights all come on briefly.

[mike100]

My 95 LT1 car used to get around 5500 mi between change oil lights based on my driving routine. I'm expecting the same for my 91 w the LT5, but i will keep an eye on the mileage just in case. I don't really like to go over 6-7k on oil changes unless it is all highway.

[rhipsher]

Originally Posted by VetteMed

Not mileage based - it's a rev counter, basically. There's a complex algorithm based on number of engine revolutions, and oil temperature, and possibly some other parameters.

I believe it. Mine comes on every 1,000 miles. I rev high allot. And mine drinks way more oil than 1 quart every 2500 miles. More like 4 quarts.

[John Boothby]

It is based on rev's and temp. However, it must be reset each oil change, and it is a bit more complicated then it is resetting the fuel milage computer.