It's an aluminum housing and a steel bolt, you don't need Locktite! Without antiseize, the last thing you need to worry about is the bolt coming out!

Just tighten to correct torque, I've never heard of one coming loose.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!