Due to a Class Action lawsuit, the warranty on the engines of 98 and forward cars sold before DC mandated full synthetics for oil changes was extended to 150,000 miles. You should contact MBUSA and register ownership of your car and ask about the extended engine warranty. Use the search engine on this site to find out about the "FSS system class action suit." Did you buy from a MBZ dealer? If so they screwed you by not telling you about the extended engine warranty.

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N. Hodges
1994 S350
1987 300 SDL (for sale)