What secrets hide in the maintenance records?Think of a G-Wagon's maintenance records as its automotive diary. They're a window into the vehicle's past, potentially revealing dark secrets that could save you from a costly headache. When you're considering a used G-Wagon, seeing these records for yourself is a must.Start by scanning for signs of neglect. For pre-2018 models, oil changes should appear like clockwork every 5,000 to 7,500 miles. The newer models can stretch to 10,000-mile intervals, but only with proper synthetic oil. Other routine maintenance like brake fluid flushes, spark plug swaps, and transmission and filter changes should all follow Mercedes' recommendations for that year and trim. If those basics were skipped, what else might've been?Then, take note of any major repairs. Rebuilt transmissions, turbo replacements, or full suspension overhauls are all worth a closer look. Big-ticket fixes like these can hint at how the vehicle's been driven, like whether it's been gently cruised or pushed to its limits. A major repair isn't always a red flag, but it's your cue to ask more questions.Ideally, you want to see a folder full of full dealer receipts for maintenance and repairs. But a well-documented service history from a reputable Mercedes indie shop works, too. If the records are just scribbles on napkins? Hard pass. No paperwork at all? Assume the worst and keep shopping.Are all the tech features working like they should?Don't let the tough exterior fool you — a G-Wagon is loaded with tech. Unless you're going way back to the early years, you'll find features like rain-sensing wipers, heated power seats, and a 6.5-inch high-res screen running the COMAND system. Of course, those premium features don't mean much if they've stopped doing their job.So before you sign any paperwork, play detective with all the buttons and screens. Start with the cozy stuff. Are those heated seats actually toasty? Does the AC blow cold when it should? Push every button, twist every knob, and make sure it all does what it's supposed to. You don't want to find out the A/C or heat is busted when the weather decides to go extreme.Then, the fun stuff. Try out the infotainment system. Does the touchscreen react as fast as a brand-new phone, or does it have some lag to it? Can you blast your favorite tunes without any speaker crackle? Does the GPS actually know where you are? Test it all because a wonky infotainment system can turn an exciting road trip into a real nightmare.Remember to check the little things, too. Do the windows go up and down smoothly? Do the mirrors adjust like they should? Are all the lights working? Even a tiny light bulb issue can point to bigger electrical gremlins.