I have noticed recently that while idling the lifters seem louder...almost sounds like a diesel engine. Oil level is good and oil pressure reads at 1/4 while idling and 1/2 while under power. I have 103k miles. Anyone having similar issues?
The older titans have oil pressure gauges that fluctuate from quarter to half, the newer ones don't. My 04 is kinda noisy under the hood too. Like Zeus stated above, keep an ear open for the exhaust manifolds because they all crack eventually.