For a dual breather you'll need:
1 - Dual Cover P/N 2830784
1 - Breather P/N 2852531
1 - O-ring Seal P/N 2852028
3 - Cap-Screws for the breather P/N 4899092
2 - Valve Cover Bolts 4895214
(1st Gen use OEM)
2 - Valve Cover Bolt Seals P/N 3935449
According to Lucas, it's 110Cst @ 100°C... IF their numbers can be trusted. Don't really want to start that discussion, but yes, it's primary purpose is an oil thickener.
Gandalf the Donkey Hauler
- '96 2500 ECLB G56
3.54's, Firerings @ 160ftlb, PDD 4K GSK, PDD 5x18's @ 260
, 025's, AFC Live, 28° Cogwheel
, AFC Stop-Bolt, HO LP
, TPP Manifold Blanket
, Billet 56/64 HX35/GT45 W/Spring gate
, OBA, OBP, CC High Idle
, Hotrod PS Pump
, Str box brace, SuperSport Headlights, DIY GN Hitch
, couple gauges. 733hp/1350tq at NWDC.
Shaughty - '95 2500 RCSB 2WD, PDD 850hp Trans, a lot less than 850hp.