General Motors — Engine Oil Replacement
Maintenance
From a General Motors operator's manual covering: 181 CID, 3.0L L4, GMG-430, LW6. Check it applies to your exact model before use.
Applies to: General Motors 3.0L L4 (181 CID) engine
Before you start
- A badly contaminated or deteriorated oil should be replaced regardless of replacement intervals.
- Replace oil filter element each time oil is replaced.
Procedure
- After shutdown, remove oil while still hot. Replace oil filter at same time.
- Install drain plug and pour fresh engine oil from oil filler port up to FULL mark on level gauge.
- After running engine at idle for several minutes, recheck oil level.
Specs & values
- Replace after first 60 hours and every 250 hours thereafter.
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.