Check the tire pressure too. A lower performance tire with the low end of the air pressure recommendations will more likely to squeal than a higher performance tire with more pressure. But, yes, a W123 will roll and heavily load the outside tires, likely more so than many other cars, and the extra load will make them squeal sooner. The surface you are driving on will have an effect too. The smoother the more likely you are to hear the squeal. Jim

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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)