You need to determine if the oil pressure light is on for a valid reason or
not. This usually means removing the oil sender and measuring the oil
pressure at that location using a manual oil pressure gauge.

Bob


"John Doe" > wrote in message
...
> Group,
>
> I have a 97 SL, 215K miles. Now that it is cold, the oil pump light takes
> a long time to go out. I can tell a difference in the valve tapping
> sounds when the light goes out. At idle, it flickers on. I have been
> using 10W-30 over the summer months. Any ideas?
>