Amsoil 5w30 '02 TrailBlazer 24899 miles

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I was considering this vehicle when I bought my Dakota. I was just starting to get into educating myself about oil,synthetics,long drains etc. Correct me if I`m wrong but this thing has a 7 qt. sump! Unheard of these days. I figured it would be a perfect long drain candidate and this UOA bears that out.
 
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Originally posted by 59 Vetteman:

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Originally posted by Andy H:

And 10K fewer miles?

And Half the cost for the oil!!!!!!!!
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I have no idea how much LC costs - how much of an impact did it make cost-wise? I'd like to do a cost analysis.
 
Andy, extremely impressive!

After seeing your UOA I've decided to chuck my oil shrine full of dino oils and move to Amsoil permanently on my 96 DOHC Saturn and my new 04 Honda V6-equipped Saturn Vue. Amsoil has proved to me, to be about as top-shelf an oil as one can buy. (just my $.02)

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Incredible. This might be the new King of UOA's. It's a toss up between this one, the Jeep ATM with 24k or the M1 with 17k. ASL/ATM are clearly the two best oils for your money and then some. They consistantly kick @ss big time! I'm glad I have ASL in my car now.
 
How much of a difference would L/C done if used in this application? This is a killer UOA I wonder how much better it would have looked with L/C? Maybe the 35k oil change?
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Just some other food for thought on this setup. The 4.2l inline six has a seven quart sump. These vehicles are also equipped with the GM engine oil life system, which we all know is a countdown type of setup that deducts based on RPMS, cold temps. etc... On my father's trailblazer, the oil life monitor seems to come on somehwere between 10,000 and 13,500 miles. Now remember, this is suggested on just a regular old dino 5w30 oil.

So, my take is this looks fine for a GM engine that is still relatively early on in its life. Probably one application where the 25,000 mile change idea may actually work, but that isn't all the oil - this engine is pretty "easy" on oil.
 
OCI (Amsoil)= (120)(sump-qts)(mpg)(cubic inches/Hp)

All things being equal, a seven qt sump will result in an allowable drain interval that is 40% longer than a five qt sump and 75% longer than a four qt sump, if the other parameters are held constant. The wear metal concentrations will also be higher in smaller sumps, and by the same percentages ....

BMW and Mercedes use 7.5-8.0 qt sumps on their six cylinder engines and 8.0-10.0 qt sumps on their V-8's. The long drain intervals for these engines reflect that engineering decision ....

As we say all the time at work - it's not rocket science ...
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Tooslick
Dixie Synthetics
 
tooslick, I got tired of changing out the oil in my wife's expedition (5.4) so I filled up with asl 5w30 got 5k on it so far, going to drop the filter at 10k and top off, what is your opinion on asl 5w30 making it to 20k on that engine? Additionally given your large sump theory, does that mean that the same oil, assuming the 5.4 makes it to 20k, run in my honda civic will only make it to 5000 miles? hmmmmm....
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Hey Timzak,
The oil filter used was an AMSOIL SDF. New filter installed with the oil, and a filter replacement at the 12,500 mile area. The only oil used for the entire 25K miles was when the filter was changed, approx a quart.
Andy
 
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Originally posted by TooSlick:
Pabs,

It's a knockoff BMW motor (in the best possible sense), with DOHC, chain drive and 270 hp ....the best GM design since the 3.8L, V-6 in the mid sized sedans.

Ted


TooSlick I heard this I6 by GM was a knock off of the I6 used my Toyota in their 1993-1997 FZJ80 Landcruiser. Many of the FZJ80 I6 engines are doing well with just regular maintance at over 300K miles. The Toyota engine is a 4.5 liter iron block aluminum head DOHC 24 valve putting out 212 HP and 275 ft.lbs of torque. There has been a few UOA on these Toyota 4.5 liter I6 engines and they are really easy on any oil that is used in them. Just a great engine design.
 
This engine is a clean-sheet design. However, it does incorporate some of the best ideas that both BMW and Toyota used in their I6s. Many automotive reviews are favorably comparing this to the BMW engines, which is alot of praise considering BMW is considered by most to build the best I6 in the world.

Still, this is an awesome UOA. However, why do some say that the old 4.3L V6 wouldn't have made it this far? IMHO, the 4.3 is about as bullet- and idiot-proof an engine that you can get.
 
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Originally posted by simpleguy_68:


Still, this is an awesome UOA. However, why do some say that the old 4.3L V6 wouldn't have made it this far? IMHO, the 4.3 is about as bullet- and idiot-proof an engine that you can get.


I think they mean you wouldn't be able to do a 25k interval with the 4.3, since it's not as "clean" of an engine, much like the 350 it's based on. It gets too much blowby to allow for super long intervals.
 
I am very surprised that this engine only requied 1 quart of make up oil. All of the Envoys with this motor that I work with (car rental fleet) use about a quart every 2,000 miles. This is hard rental miles running 5w30 dino though.
 
quote:

Originally posted by simpleguy_68:
This engine is a clean-sheet design. However, it does incorporate some of the best ideas that both BMW and Toyota used in their I6s. Many automotive reviews are favorably comparing this to the BMW engines, which is alot of praise considering BMW is considered by most to build the best I6 in the world.

Still, this is an awesome UOA. However, why do some say that the old 4.3L V6 wouldn't have made it this far? IMHO, the 4.3 is about as bullet- and idiot-proof an engine that you can get.


I'd say BMW makes the best natrually aspirated Inline-6, but there I-6's don't hold a candle to Nissans RB26dett used in the R34 skyline GTR or Toyota's 2JZ-GTE used in the 4th generation Supra Turbo. One things for sure though, I-6's are still the best engine configuration except for of course the V-12, the only two motors I know of with 7 main bearings.
 
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