Engine Lubrication System: Notes
WARNING: This page does not describe the selected car, but rather 55 other vehicles, including the 1999 Oldsmobile Bravada, 1999 GMC Yukon, 1999 GMC Suburban, 1999 GMC Sonoma, and 1999 GMC Sierra. However, it is still accessible from the selected car via links, so may be relevant.
Gear-type oil pump delivers full pressure lubrication through full-flow oil filter to main oil gallery. Main oil gallery feeds crankshaft and camshaft bearings through drilled passages in block. Valve lifter oil gallery feeds valve lifters. From lifters, oil is routed through hollow push rods to upper valve train components. Timing chain and sprockets are lubricated by oil drainage from No. 1 camshaft bearing. Pistons and piston pins are lubricated by oil splash. Nonadjustable oil pressure regulator is located in oil pump body. See Figure.
CRANKCASE CAPACITY (1)
| Application | Qts. (L) | ||
|---|---|---|---|
| 4.3L | 4.5 (4.3) | ||
| 5.0L & 5.7L | 5.0 (4.8) | ||
| 7.4L | 6.6 (6.3) | ||
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