Lot SR20210291: 2018 Mercedes-Benz E400 4MATIC Coupe

Hey there! Great question about the M276 engine in that 2018 E400 you’re looking at. The M276 DELA 30 twin-turbo V6 is generally a solid powerplant, but there are a few things to keep an eye on based on my research and owner experiences.

The Big Three Issues:

1. Oil Leaks - This is the most common headache. The front upper timing covers love to seep oil, and you’ll often see oil cooler seal failures too. It’s not catastrophic, but plan on $800-2000 for a timing cover reseal when it starts dripping.

2. Carbon Buildup - Being direct injection, the intake valves get gunked up with carbon deposits. Many owners notice the oil turns black quickly (like diesel-black) even with highway driving. You’ll want walnut blasting every 60-80k miles for about $600-1200.

3. Timing Chain Rattle - You’ll hear this on warm startups - sounds like marbles in a can for 2-3 seconds. It’s usually worn tensioners or chain stretch. Budget $2000-4000 if it needs full replacement.

The Good News: These aren’t deal-breakers - they’re manageable maintenance items. Plenty of owners report 150k+ miles without major issues when properly maintained. At 33k miles, this one’s still relatively young and these issues typically show up later in life.

Given the $29,995 asking price on this white-on-white coupe, I’d factor these potential repairs into your long-term ownership budget, but don’t let them scare you off. The M276 is generally reliable when you stay ahead of maintenance.

Want me to help you find similar E400s to compare, or do you have any other questions about this specific car?