engines during the first series. U.S. models, including the 300 SD Turbodiesel, had automatic transmission as sole transmission choice. Second Series (1985-1991) From 1986 onward, the automatic transmission was revised to include the option of selecting S (Standard) and E (Economy) shifting points. The models, 260 SE, 300 SE, and 300 SEL were fitted with standard 5-speed manual and optional extra-cost 4-speed automatic transmissions. For one year from September 1986 to June 1987, extra cost automatic transmission option wasn't offered for 260 SE and 300 SE. The customers ordering 420 SE could choose either 5-speed manual or 4-speed automatic transmission. U.S. models had automatic transmission as sole transmission choice. U.S. Grey Market When the W126 was introduced in the United States in September 1980, Mercedes-Benz offered the smaller 3.8-litre V8 engine only as to avoid the gas guzzler penalty under Corporate Average Fuel Economy (CAFE) regulations. However, the American consumers found 380 SEL severely underpowered with slow acceleration (0–60 mph in 11 seconds) and lower top speed of . As the fear of oil crisis waned in 1982, the American consumers demanded the more powerful S-Class models, and grey importers brought the S-Class with 5-litre V8 engines to the United States and modified them to meet US FMVSS and EPA regulations. The smaller-engined 280 S-Class was also imported, offering significant savings over the V8 models. The W126 was a major part of this parallel market, with 22,000 imported in a segment that hit 66,900 cars in 1985, the biggest year for grey imports. Consequently, Mercedes-Benz added 500 SEL/500 SEC to the American model range for 1984 model year as to countereffect the grey imports while 3.8-litre V8 engine remained in 380 SE (standard wheelbase only) and 380 SL. In 1988, an intense lobbying effort by Mercedes-Benz and other foreign manufacturers led U.S. Congress to eliminate this consumer option and revise the rules for registered importers. Special variants Although it hadn't yet merged with Mercedes-Benz, "pre-merger" AMG offered body kits for all W126 models, as well as a "wide body" kit for the coupé. The "wide body" cars were fitted with distinctive AMG-designed front and rear fenders and door panels that allowed much wider wheels and tires to be fitted. AMG also offered engine modifications with displacements of 5.0, 5.6, and 6.0-liters. The most famous and rarest was the DOHC 6.0-liter engine, based on the original 117.968 engine. Some of options