There is what I run, 2 year warranty on it at the parts store, so it gets warranted every oil change, its for a 4.3l Vortec V6 and adds about half a quart to the engine oil.
Si Vis Pacem, Para Bellum
'89 K5 Blazer, 350, 700r4, Np241, 10 Bolts F/R, 33x12.5 BFG Mud Terrains, converted from TBI to Carb.