Oil Consumption Test

[Kushog]

I am currently doing the oil consumption testing for my 2008 Sierra 5.3ltr. I did it the first time and the dealer installed the defletor sheild and decarbonized the cylinders. The truck is still losing oil. Now i was told by the service manager that the oil consumtion test has to be done 2 or 3 more times. Did any one else go through this and how many tests did you go through and what happened for the end result? Was it fixed?
Rick

 

[Z15]

Welcome to GM's bad design Active Fuel Management (AFM). I never had any problems with mine but I traded it in and got rid of the no-good AFM 5.3L engine. I got a Sierra Denali with 6.2L, no AFM.

Judging from what others say, you are likely going to be a year older before GM fixes is for good with new pistions. Forget about getting a new engine, that will never happen. Really can't blame the dealer because GM makes them go through all this BS. The dealer cannot side-step a GM process or he will not get paid.

I firmly believe GM considers oil consumption a necessary evil to get better fuel mileage to satisfy the gov't regulators who want unrealistic fuel mileage improvements from trucks and SUV's.

 

[Kushog]

How is the fuel consumtion with the 6.2ltr.

 

[Z15]

Well in just over 5,500 miles my average is 17.4 mpg. The average with the 2010 5.3L was 17.7 over 25,000 miles and 2 yrs. I never pay attention to any other mileage reading although checking it just for kicks once on a 500 miles trip I averaged 18.2. Per the window sticker 12-18 is the range. It runs ragged on lower octane fuel and recommends E85 or premium be used.


PS - I am a very conservative driver, don't hotrod or drive very fast. If you were that kind of driver (and I know someone who is) 12 mpg would be the norm.

Check out his FORUM you will get more feedback on issues like this.

 

[Kushog]

Thats no that bad for fuel consumption.
Thanks for the other forum, I am on there as well.

 

[Z15]

No but I live in a semi-rural area, few traffic lites to drag race from and lot of 2 lane black top between the small towns. U.P. of Michigan on the shore of Lake Superior about due North of Green Bay.