RTV might work, but it's more of a gasket maker than a sealant. If you really want it to last I'd probably use 3M 4200 (moisture cured polyurethane) sealant, or Butyl tape. You have to clean off the silicone residue to get these to adhere, which can be difficult.
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'84 760 D24T/M46
'86 Isuzu Trooper Turbo Diesel
'01 VW Golf TDI
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