1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 77Get this manual
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REMOVAL AND INSTALLATION
LubricantsSealantsAdhesives
Description Engine Coupler Spline Grease Quicksilver Liquid Neoprene Quicksilver 2-4-C Marine Lubricant With Teflon Loctite Pipe Sealan