I have a 2005 Unlimited with a build date of October 2004. I have read on here and other places that 05/06 models have premature oil pump failure as well as camshaft problems and I know the earlier models with the distributorless ignition systems had a slightly different set up but, mine is set up just like what I see here. I have 85k on mine and haven't had any problems and show no TSB or recalls I was just wondering if I should be worried or not? I have been using the Valvoline VR1 10w-30 with the ZDDP levels the flat tappets need thinking that it will be my safest bet but, I just wanted to know everyones thoughts on all this?
You will know for sure when you pull it. There is a video on the first page using the sharpie method. In 20 minutes you'll know for sure what shape you're in. In my experience, the norm is premature wear. There are instances of OPDA shaft binding (that the FogMOD eliminates or at least substantially reduces), however the time frame of failure is not consistent. Some times you get a warning squeal, some times you toast an engine. It can happen at 12K, 50K, 100K there is no rhyme or reason for the delay that we have identified here. Maybe oil type, driving habits, break-in, we just don't know.
The concensus here is to complete the FogMOD and change the oil to VR1 or M1TDT. Again everything is outlined on the first page. Doing nothing is not advisable. There are some who have had no problem and some who need a new engine. I would recommend having a preventative outlook.
1. Check it for wear (highly likely at 85K). Free.
2. Replace with a new unit at a minimum. $120ish, link on first page.
3. FogMOD is highly advisable since shaft binding has been seen and can cause catastrophic failure. $40-60 ball park for tools, or having someone do it. If you're not good with machining PM me.
4. Run VR1, M1TDT, or ZDDPlus additive. $40 Oil cost
Whatever you do, don't do nothing.