I got it, Dennis. I had some over-oiling problems with a filter once upon a time, so don't take my word on the filter thing as i'm not competent enough to oil them properly.

 

That's cool Blade...I didn't mean anything derogatory or insulting towards you...It's just that people get the wrong impression of this good filter when someone has over oiled them and blame the filter as the culprit for the fouling of the MAF...

 

Is the GM factory filter for the H3 made by AC-Delco? Can you buy it at a Pep Boys or similar place, or do you have to get it directly from the dealer?

 

I'm sure it's AC Delco. BTW, my local Chevy dealer (about 1/2 a mile from home) sells them for about $4 so I stopped making the 10 mile run to Autozone. My local ShopRite grocery store also sells Mobile1 for about as cheap as I've ever seen it anywhere so that's where I buy my oil.

Considering the new "Palace" that Hummer built in my area, I wonder what they are charging?

 

I have been following this post and it has me stumped. In every new vehicle I have ever owned, I seemed to get a little better fuel mileage with my first oil change. Not saying it was the oil change itself, as I always thought that it was mostly the vehicle being broke-in as to why it got better.

I had a K&N Cold Air intake installed in my 2000 Nissan Frontier and had problems with the MAF from day one. The Check Engine light would come on if I had the airconditioning running while the vehicle was running at idle when sitting in lines like at the bank, long lights, or other types of long idling. I had to turn off my air to stop the light from coming on. Was a pain. With that and the sucking noise, it really was an attention getter. I would draw strange looks where ever I went. I did gain between 20 to 45 miles per tankful of fuel and that was a plus. When I traded my Nissan in on my H3, my 16 year old daughter made me promise not to put one on the H3! The sound to her was an embarrasment. I did order a K&N air filter replacement for my H3 as I had one on my wife's Mercury Sable and it worked good without any trouble on the engine light coming on.

I am planning on using K&N oil filters with Castrol Syntec oil and maybe after 9000 miles, may try Royal Purple as my son was telling me about it about a year ago and said he heard it works good. My brother-in-law also uses it in his BMW. I have 1600 miles on my H3 and plan on changing the oil at about 2500 so I will let you guys know how my milealge changes for better or worse.

 

I have been using syn oil with K&N oil filters for a long time, many years before I got my H3. I just can't see either the oil or the filter causing a loss in MPG.

Have you noticed any other things like, any smoke on start up, hard idle, louder whine on acceleration? Could be one of many things that could casue this drop in MPG. Make sure tire pressure is up, none of the brakes are dragging, also don't switch gasoline brands for a few more tanks while you keep track of your mileage.

BTW, I use Amsoil and K&N oil filter.

Good luck let us know what happens.

 

I had free oil changes up untill 20K and just replaced it first time couple months back since it run out. I had a coupon for them so it cost me $19.99. Not sure what they charge regular. But they did charge way too much for any kind of service even at their old location so who knows.

 

I have never used synthetic and the dealer has never recomended it.I run valvoline oil and a true flow air intake and get 19-20 mpg consistently on the hwy.

 

Could it be possibly your winter type fuel that you are getting? This could affect your mileage, and may increase when summer comes.