General Motors — Replacing engine oil
Maintenance · Engine oil pan
From a General Motors operator's manual covering: 4.3L 262 CID, 4.3L V6, GMG-643. Check it applies to your exact model before use.
Before you start
- A badly contaminated or deteriorated oil should be replaced regardless of the replacement intervals.
- Replace the oil filter element each time the oil is replaced.
- Replace the oil on a new engine after the first 60 hours of operation.
Procedure
- After shutdown remove the oil while it is still hot; the oil filter should be replaced at the same time.
- Install the drain plug and pour fresh engine oil from the oil filler port up to the FULL mark on the level gauge.
- Run the engine at idle for several minutes then recheck the oil level.
Source: General Motors operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.