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  #1  
Old 03-07-2011, 07:43 PM
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Default Oil change question.

I did my first oil change at 3500 miles, the oil change light never came on. I put in penzoil full synthetic with a K&N filter. I figured I would change it at 8500 miles. Well the message just pop up today at 7500 miles. Do you guys think I can hold off till 8500 cause of the synthetic and not pay attention to the message or should I change it out now.
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Old 03-07-2011, 07:49 PM
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Well I put synthetic in mine at 5000km, the reminder came on at 8000km so I just reset it. I think you'll be fine but it is your choice. Just make sure your change intervals are at least as frequent as the owners manual states.
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Old 03-07-2011, 08:30 PM
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Yeah, key to run position without starting the motor and press the gas pedal down three times to reset it!
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Old 03-07-2011, 09:14 PM
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So the message is just a reminder? The truck is basically preset for that? I rember one dealer saying it should go off every 3k and it measures viloscity. I guess they don't calculate for the synthetic which you can run longer.
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Old 03-07-2011, 09:22 PM
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The controls system cannot calculate the viscosity of the oil. It would require a viscometer or spectrometry analysis to do so, and it would be very cost prohibitive. The newer vehicles(our trucks), and some older ones like my ancient 1998 buick, calculate oil life based on duty cycle. Numerous data curves are applied, to determine the rate at which the detergents in a conventional sae approved oil will deteriorate to the point of needing to be replaced, based on how you drive. Drive really aggressively all the time or allow short engine run cycles and you will be changing early.

What to know how your oil is really doing when you change it, send a sample to BlackStone Labs

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Old 03-07-2011, 10:13 PM
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I think the new corvettes actually measure viscosity. My question is if I drive my truck in city conditions for 8 months but only have 2500 miles on it would when would you change it?
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Old 03-07-2011, 10:51 PM
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Quote:
Originally Posted by Freightrain View Post
I think the new corvettes actually measure viscosity. My question is if I drive my truck in city conditions for 8 months but only have 2500 miles on it would when would you change it?
Depends if you want to keep your warranty valid, and like your engine. If your vehicle is out of warranty then I would wait as long as 12 months to change the oil if its has less than 5,000 miles on the oil change interval. Manual says to change it 8k miles or 6 months. It's best to do what the manual says, or change it sooner. I would never let my oil and filter get past 7k miles. I use conventional oil and change it and the filter at 4-5K in summer and 5-6k in winter. That's just me though
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Old 03-07-2011, 10:57 PM
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Quote:
Originally Posted by Freightrain View Post
I think the new corvettes actually measure viscosity. My question is if I drive my truck in city conditions for 8 months but only have 2500 miles on it would when would you change it?
I doubt it. Viscosity is temperature dependent and the tools(viscometer) required to accurately measure it would cost more than the corvette itself. GM still uses the same algorithm in the new vette that they use in my old buick, it is slightly modified to take into account extra cylinders, fuel usage, and engine demands.

You should have changed it at 6 months(IIRC from the manual), if the duty cycle calculator did not tell you to change the oil as it is only a duty cycle calculator and will not count time from last oil change and degradation from change.
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Old 03-07-2011, 11:04 PM
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On a brand new vehicle you should follow the owners manual recommendation. That way it can't be used against you in the case of a dispute.
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