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I never payed attention to what the ZL1 took, I wonder what the difference in the oils between SS Rear and ZL1. I drained the Factory Diff oil at 14K miles and went with Amsoil, I only had it in for about 100 Miles ( Zero issues and i did not add any extra additive ) After 100 Miles I swapped gears and went with a Tru Trac and And running a non synthetic Gear oil Toroco Brand. I did drain it after 500 Miles and replaced with same and mine looked like yours with the sludge which I am assuming was from Break in.
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GM 3.91/TrueTrac OEM ZL1 Rims, 6 Piston Brakes & Side Skirts.ACST4 Splitter/Deflectors NPP M2W,GM Short Throw,GPI Ported Rod Mod,BO White PTB,CAI/JRE Scoop, GC Aluminum DS,Stainless Works Ceramic LTH/HiFlo Cats, Hotckis 1" Springs & Chassis Max Brace BMR Adjustable Swaybars,Trailing Arms, Adjustable Toe Rod, LCA & Z28 UCA Bushings Hendrix Solid Cradle Bushings Pedders Radius Rod Inserts Strut tower brace, Moroso Catch Can,SCT X4 Dynosteve,Remote Clutch reservoir,Hero Smoked Tail and 3rd Brake Light, Diode Dynamic SL1 Fog Lights
AeroForce Dual gauge/Autometer pillar mount.
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