| 1999 E320 Wagon 93K, Changed my plugs (NGK 7090) last week - first time I had ever changed spark plugs on any vehicle. Took about 3.5 hours but I was taking my time. I didn't run into any major snags - the old plugs were really screwed in tight though. The Spark Plug tool sold by Oh Lord was critical. It really made pulling the boots off a snap and what became quickly apparent was its usefulness getting the boots back on in the confined space. The drivers side plugs look more difficult but they were actually the easiest. My electrodes had worn out to the point that they were all showing a gap of about .45 (vs the recommended .39/.40) but the car had been running fine. I just changed them since the car had so many miles on it and I am getting ready to leave on a cross country trip. This is a great website for DIY maintenance and I will post anything I can that may help out someone in the future. |