We are not aware of any specific issues with the SRT’s big V8, but the Grand Cherokee doesn’t have a great reputation for reliability. It has been subject to a number of recalls for various problems, and we would urge you to have a Jeep dealer check any vehicle you might consider buying before you do so. Fuel consumption is also something to think about with the 6.4-litre V8, it uses fuel and usually more than most people anticipate when they buy one.