CSI-WALLEYE

I use redline too. how often do you use it? Also do you change the VLOM filter yourself?

Thanks for this information. My truck has 30 000 km and the afm works great. Can't feel the switch at all. I am on the fence about deactivation. I don't want to mess with a good thing. I use Ansoil Signature and change it often. I do like to keep my vehicles a long time so I may still deactivate.

this is the info I would like to have.

Thanks that link is very informative. Lets you know just how complex these engines are.

Hey Guys, Thanks for the quick replies! The consensus seems to be that the AFM system works fine with proper maintenance. It is difficult to find accurate information. I like to keep my vehicles for a long time. I had my Safari van for 17 years before I sold it. I am using high quality synthetic in my truck (Amsoil Signature) so I don't think I will have oil issues. I also don't like to mess with a vehicle that is working well.

I have a 2017 5.3 4x4 Sierra work truck and I love it. It shifts just fine, I can't even feel it when it shifts from V8 to V4, but I am concerned about lifter failure in the future. I am more than willing to give up a bit of fuel efficiency for reliability. My questions are: 1) Do 2017 trucks have lifter problems, or have that solved that problem? 2) Do the AFM disablers (like Range) solve the problem or do I have to remove the lifters and replace then with the standard lifters? Thanks,

Thanks for the reply Grumpy. I have the same suspicions. There are millions of trucks out there and we are hearing mostly from people who are having problems. Is this due to design flaws? or is it due to abuse? or is it column A and column B? It may be that several different types of abuse may all expose a weakness in the transmission that will never be seen with proper care. I am new to truck ownership but from reading sites like this is It seems that if you avoid modifications and perform recommended maintenance you can avoid a lot of trouble.

Sorry this is on the wrong thread.

Wow. Eat a Snickers. You'll feel better.

Some great input here thanks everyone. This is the first vehicle I have owned that has AFM and direct injection. Also the numerous posts indicating tranny problems has me a bit nervous about changing anything because my AFM and transmission are super smooth. I would prefer to switch to amsoil on my next oil change this summer.

I have a 2017 Sierra with a 5.3. I have had free oil changes for the last two years and have used the dealer's supplied Dexos. My engine and transmission are working great. I have read that many people hare having issues with AFM and hard shifting trannies. I have use Amsiol signature in all my other vehicles. Has any one switched to Amsoil and experienced problems? I am wondering if I should leave well enough alone.

should you use towing mode every time you tow or only when towing heavy items?

How common is this problem? are the problematic transmissions defective or is this a design flaw? If it is a design flaw why don't they all have problems?

Yes this is true but I think everyone would like to find out if their modification is actually beneficial or at least not harmful. Freedom of choice is one thing but you can't make good choices if you do not have good and accurate information on which to base your decision. This is why I started this thread. Catch cans make logical sense but there is data that is missing that makes me suspicious. Unfortunately, I do not have the detailed engineering knowledge to call BS on the theory. I have been going back and forth on the issue. Right now I am leaning on the negative side. If they really were working someone would have performed a study to demonstrate it.

I think the discussion was more in-depth than this thread.