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My oil change interval is 10000km. I have been doing this for the last 30 plus years.
No failures yet got to love synthetic oils. Always use synthetics in the transmissions and differentials also.
 

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I'm a big advocate for synthetic oils and have used them almost all my life - still think it is the best.
Up until I bought my 2010 Terrain, I've always changed my oil(syn) every 6 months or 7500 miles. Now I have this %$# Terrain with a 6 cyl. DI engine. I have 8% fuel in my oil - waaaaaaaaay above accepted levels and according to experts (many) my engine will - if not fixed - self destruct in no time. I've been knocking heads with GM for the last year and so far no help. I have another appointment with the dealer next month for another UOA (guess the previous 4 don't count). So I would highly recommend getting a UOA ASAP. If you have this problem you had better change your oil a lot sooner then normal or your engine may not last very long.
There are many people with this problem, so far not as many with as high a level as mine(that I know of), with either engine - but especially the 4 cyl.

If you don't have this problem (lucky you) then by all means change at 5k to 7.5k intervals - and don't forget the filter - that's just as improtant as the oil.

I would recommend before saying you don't need to change at less then 5k is get a UOA. Better safe then sorry.
 

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dwendt44 said:
How many owners would/will keep a vehicle for 300,000 miles? Very, very few I'd bet.
Especially those the buy new.
the rest of the vehicle will rot away around a well maintained engine before 300K miles.
No vehicle is going to rot in Califonia. no salts on roads.
But yeah- not many are going to keep it 300K.
I did see alot of people with Trailblazers/Envoys with the Inline 6- change oil EVERY 3000 miles. WITH synthetic. What is surprissing- is that the Inline 6 takes 7 quarts of oil- with filter change... Thats alot of oil and money for Synthetic.
Many of those people surely wouldnt keep for 300K- not even 150K. Waste of money on my opinion for a vehicle they werent goint to keep for long.
I was content following the OLM and using Valvoline dino in that engine. Its doing fine. And Passes CA smog test with ease. (on rollers).
My 160,000 mile 2003 Trailblazer.
 

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WOW! very clean! nice
 

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I can't believe people still believe syn oil costs more - IT DOESN'T!!!

When you factor in doubling or in some cases tripling the change interval, it's not any more costly then dino oil. You also save on the number of filters. Plus the money you save on labor to do the change. Last but not least, you're helping the environment and land fills from all that plastic.

Of course it also depends on how much you pay for your oil/filters or the shop labor.
I"m lucky to be able to do all my own changes and I save a ton of money.
What some of my friends do is buy oil when it's on sale and take it to their oil change shop and just pay the labor costs. Some shops will do that and some will not.

My Harley dealer wil do that for me in the winter when I can't do it myself - actually I don't WANT to do it then, Chicago can get a wee bit cold in the winter. ;D
 

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I follow owners manual... 20%... (I actually go at 25%). I figure GM backs it for their warranty so I'll stick with their advice.
 

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wrusprod said:
WOW! very clean! nice
He never said when the picture was taken. Maybe it was 2003 when they brought it home. just kidding. Looks great.
 

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GARYD said:
I can't believe people still believe syn oil costs more - IT DOESN'T!!!

When you factor in doubling or in some cases tripling the change interval, it's not any more costly then dino oil. You also save on the number of filters. Plus the money you save on labor to do the change. Last but not least, you're helping the environment and land fills from all that plastic.

Of course it also depends on how much you pay for your oil/filters or the shop labor.
I"m lucky to be able to do all my own changes and I save a ton of money.
What some of my friends do is buy oil when it's on sale and take it to their oil change shop and just pay the labor costs. Some shops will do that and some will not.

My Harley dealer wil do that for me in the winter when I can't do it myself - actually I don't WANT to do it then, Chicago can get a wee bit cold in the winter. ;D
Right you are. If you stock up when it's on sale, and watch price fluctuations, synthetic oil can be purchased $25 for a 5 qt jug.
Filters are often on sale too. Pick a couple of brands that you are comfortable with, compare oil prices to Wal-mart's price, and stock up.

Around here, central Wisconsin, a lot of places are advertising $20 and $25 oil changes. That's with bulk oil, but they'll gladly do it with YOUR oil and filter for a reasonable labor charge IF you can't or don't want to do it yourself.
My 2¢
 

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Dawgdaes said:
He never said when the picture was taken. Maybe it was 2003 when they brought it home. just kidding. Looks great.
yeah- looks nice. Never been waxed either. just gets washed often.
but as reference that is a 2007 Impala- and a 2010 Traverse in the pic.
The Trailblazer has not been garaged- and has made plenty of road trips--- Los Angeles to Florida 4 times. Los Angeles To Guadalajara, Mexico 4 times..... VROOOM VROOOM VROOOM.
We hope to replace the Impala with a Nox.
 

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Something to keep in mind for those looking to go long intervals, per GM specification, the acceptable amount of engine oil consumption is 1 qt per 2000 miles for a normal drive (and up to 1 qt per 500 mi for a rough driver). Of course, there are oil sensors which should tell you when the oil is low, but those don't go off until the level has dropped quite a bit.
 

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As many cars I have had, I have never had one go through that much oil between oil changes...GM says 1 qt per 2k miles is acceptable?? thats alot of oil!
 

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wrusprod said:
As many cars I have had, I have never had one go through that much oil between oil changes...GM says 1 qt per 2k miles is acceptable?? thats alot of oil!
Yes, it is! I wouldn't want to go 15K between changes at that rate....
 

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you would run out of oil before 15k!!! :D
 

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For my 2011 Equinox, I'm changing every 7,500 miles because I'm in my dealership then anyways getting my tires rotated. They have a program that allows you two free sets of tires if you get your oil changes and maintenance at their dealership.

I changed the first time at 3,000 miles, when my "Oil Monitor Life" stated I was at about 80%. I then came back in at 7,500 (since I had to do a tire rotation anyways), but am now planning on coming in every 7,500. I'm here now with a shade under 15,000 and am getting an oil change and tire rotation. They're also giving a complimentary (gotta love perk programs) alignment, car wash and "gloss renewal treatment".

If you go by my oil life monitor, it's stating that I can go about 14,000+ miles between oil changes, but this I do not trust. So, I'll split the difference.
 

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Better get a UOA. Best investment any car owner can do.
I just got my latest results back and at ONLY 1650 miles I now have 10% fuel in my oil. No wonder I'm getting such lousy mpg.
Can't wait to see what the dealers analysers come up with.
 

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WOW! Gary, is the dealership still acting like there is no problem??!
 

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YES
 
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