Since many (if not most) of today's GM cars have a "black box".. it would be
interesting to know if this info storage device keeps records of oil and
Do any of you Tech's know the answer?
You need to re-read my post and what I said the owners manual
says. I didn't say what you are attributing to me. And I can win
that argument even with a newer GM vehicle. Do you want to
put money on that fact that there are some newer GM vehicles
that have right in the maintenance schedule to change the oil
at 3000 miles?
Actually you may not have gone "long enough"... it depends on how you drive
the car etc...
Here's an easy way to see if it's working. Get your owners manual and find
out how to get a reading for "remaining oil life". You didn't say what
model or year car you own. Once you have a reading, after you've driven for
a couple of days, see if the reading has changed to a lesser amount. If it
has, then your oil monitor is working correctly.
I find on my 04 Impala, which is driven almost exclusively on the highway at
higher speeds, could EASLY go 14-15,000 miles between changes, although I
always get it serviced before then.
Changing your oil without resetting your sensor will NOT result in it coming
on sooner (although it will be sooner than it would if you didn't) as the
sensor actually detects various chemical levels in your oil as part of the
overall formula it uses to determine when it's time to change oil. So
although based on engine revolutions alone it would be time to change, as
part of the formula the system uses, if your oil is still in great shape
(which it would be if you changed it)... the change oil light is still not
going to appear.
Hope that helps.
Shiden... here's the problem (least I think so).
You and I are clearly referencing two different devices.
The oil sensing device currently in use on GM cars, and several others such
as BMW, analyze the remaining additive commonly referred to as ZDP. The
computer driven formula also keeps track of engine revolution, starts/stops,
and a variety of other conditions.
This is clearly demonstrated when I compare the oil change frequency between
my Impala and the Equinox. My Impala is driven 99% highway for long
intervals. Although I never drive it until the oil light appears, I could
easily go 12,000 miles without it making an appearance. The Equinox, which
is driven 80% in slow congested driving with the average speed on a tank of
gas being around 25mph... is at 30% oil life remaining at 3,000 miles.
There are several lengthy articles explaining the formula in detail on line
if you'd care to search.
I think you raise a point which have been somewhat illuminated to me in the
last 48 hours. While there ARE some cars that indeed actually monitor the
condition of the oil, it appears that while GM wants to give you that
impression, in reality it could be that it's all a computerized mathmatical
formula based on a variety of conditions that the system monitors such as
starts, stops, engine revolutions, just to name a few.
Now that you've peeked my interest, I'm investigating further as it appears
I may have been grossly misinformed.
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