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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain

02-09 Vortec 4.2L I-6 Engine and Drivetrain Q&A forum for engine and drivetrain repairs/modifications/tuning.

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  #1  
Old 12-30-2006, 11:57 AM
leeosenton leeosenton is offline
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Question How often should oil changes be done?

I have a 2006 TB with the 4.2 6-cylinder. I have read the book and followed the onstar links for information about oil life. The book does not specify an exact mileage, it states that the mileage varies based on operating conditions and that a light will illuminate when it should be changed.
The oil change light has not come on, but I am at 6000 miles and can't stand it anymore. I changed the oil today and reset the oil life indicator (I guess it worked; there is no confirmation on non-DIC trucks). The old oil was thick and very black, and by traditional methods it appeared to be overdue for an oil change.
What does everyone else do? Is this new to later TBs or is this common to all? If you have an older or high mileage TB, what are you doing and how is your truck running? Thanks

Lee
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  #2  
Old 12-30-2006, 12:00 PM
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Our extended warranty make us change it every 3600 miles or 3 months, whichever comes first. We usually have about 65% oil life remaining according to the DIC
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  #3  
Old 12-30-2006, 12:01 PM
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i change mine between 3500-5000mi. and its running strong when i bought mine thats what the guy did before me so why change something if it aint broke
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  #4  
Old 12-30-2006, 12:18 PM
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3-6Kmi is a safe bet with spec'd oil. Any longer & I'd run a full synthetic and the best (most $) filter I could find.

Joel
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  #5  
Old 12-30-2006, 12:45 PM
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If you have a current Onstar subscription, you can go to their web site and sign up for "OnStar Vehicle Diagnostics" Once a month it will scan all the systems on your vehicle, and send you a report, including the percent of oil life left, and at what mileage your next oil change is due.
GM spent a lot of time/money designing the oil life system. It works really well. Remember the I6 holds 7 quarts of oil, therefore the oil doesn't "wear out" as fast. Some have gone as much as 10-11K before the light comes on - others as little as 3K. Mine usually comes on around 8K.
http://www.gm.com/company/gmability/...qa_040104.html
If it makes you sleep better at night, spend the extra $ and change the oil every 5K.
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  #6  
Old 12-30-2006, 02:42 PM
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im one of the ones that gets about 9 to 12000 miles before lightcomes on.
I have an 03, I6, 3.73 gears. all stock, and I will hit 96,000 soon. still have the original plugs in there too.
I have never changed the oil at the 3000 mile mark. have changed at 6000 to 9000 on average.
I`m currently typing this from a 4 computer internet cafe in Guadalajara Mexico, I changed oil before we drove down here... just because I already had more thant 6000 miles on previous oil....
But on the trip down here with 3 adults, 1 german shepherd, luggage, gifts, ice cooler, roof rack back, I achieved an average of 19 MPG. with best of about 22 and low of 17 I think.
When its just 2 passengers and take long drives and I baby it.. I can safely say I can get 24 MPG.
My normal everyday traffic and roundtown I also safely get 18 to 19 MPG and that includes stop and go...
so 19 MPG with all cargo and passenger and large bag on roof was great.
I safely trust going 6000 or more between oil changes.
As stated also. the I6 has to wear down 7 quarts of oil.... not the typical 5 or 6.
My engine has plenty of power too.
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  #7  
Old 12-30-2006, 03:19 PM
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Quote:
Originally Posted by leeosenton View Post
I have a 2006 TB with the 4.2 6-cylinder. I have read the book and followed the onstar links for information about oil life. The book does not specify an exact mileage, it states that the mileage varies based on operating conditions and that a light will illuminate when it should be changed.
The oil change light has not come on, but I am at 6000 miles and can't stand it anymore. I changed the oil today and reset the oil life indicator (I guess it worked; there is no confirmation on non-DIC trucks). The old oil was thick and very black, and by traditional methods it appeared to be overdue for an oil change.
What does everyone else do? Is this new to later TBs or is this common to all? If you have an older or high mileage TB, what are you doing and how is your truck running? Thanks

Lee
I know this topic has been beat to death but I'm with you. If the oil looks dirty , it's dirty. While the oil itself does not break down as in years past, I do not believe in recirculating dirt throughout my engine and oil changes (under thirty dollars) are cheap insurance. I change mine every 3000 miles or so, but that's just my preference.
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  #8  
Old 12-31-2006, 04:44 PM
uwgriz uwgriz is offline
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One thing to keep in mind relative to the stand-by 3000 mile mark, is that the mileage you get between oil changes is affeted by a number of things including (as stated) oil capacity. When I worked for Cummins Engine I learned that one of the things that was absolutely critical to over the road trucks is long maintanance intervals and in short, more oil capacity means more time between oil changes (pretty much on a 1 to 1 basis (doube capacity, double mileage)). That being said, since the 4.2L has a capacity of 7 qts. which is quite large compared to most light duty gasoline engines, don't be too surprised if your light doesn't come on when you might expect. Most light duty truck engines have around a 5 qt capactity so we have an extra 40% of oil on board. That translates to roughly to an extra 40% of miles between changes. So even if you usually change oil at 3000 miles in a 5 qt engine, 4200 miles would basically be the equivalent for a 7 qt engine. Now, since oils and engines have gotten better, many engine manufacturers are recommending longer oil change intervals so between that and the additional capacity, 6000 miles and still no light doesn't surprise me at all.

Of course, like 85vette said - if it looks dirty, it is. Personally, I change anywhere from 5-7K on my Envoy, but I'd never tell someone that they're changing oil too often. Despite all of the improvements, it is still cheap insurance. Just my $.02.
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  #9  
Old 12-31-2006, 04:57 PM
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My method. I use the DIC trip odometer "B" for my oil change mileage. Then I reset my Engine Oil Life Remaining parameter.

At around 3,000 miles on the oil Im at about 70% oil life remaining. I check the oil, top off if necessary but I pay close attention to the color of the oil. With 7 quart capacity and a synthetic oil - 3,000 miles is a drop in the bucket for the I6.

At around 5,000 miles I change the oil out of principal. I can go more miles based on an oil analysis I had once by Blackstone Labs (about $20 and well worth it!). The oil analysis report indicated the oil additives and protectants were slightly less than 1/2 depleted. I could've easily gone 9,000 miles on synthetic oil according to the analysis!

I change the oil anywhere between 4,000-5,000 miles. Depending on how dark it gets. I have 93,000 miles. Its personal choice. If you use a quality synthetic oil and check it often you can get well over 5,000 miles out of the oil and probably closer to 9,000 miles. I encourage an oil analysis for you to determine the best mileage out of your oil.
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  #10  
Old 12-31-2006, 06:59 PM
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TBlazin7 TBlazin7 is offline
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I change at every 3K. Doesnt cost much to do, and gives me a little piece of mind...
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