However, some general guidelines based on common engines for that year:
* Most likely: Many 1994 Chevy 4x4s used a conventional 10W-30 oil. This was a common recommendation for many engines of that era. Check your owner's manual to confirm!
* Heavier-duty engines or extreme climates: Some engines or driving conditions might benefit from a heavier oil like 15W-40. Again, refer to your owner's manual for specifics.
* Modern oils: While older manuals might specify older API certifications, modern oils (like SN Plus or SP) will usually meet or exceed the requirements of older engines. Still, checking the manual is crucial to avoid potential issues.
Never assume the correct oil type. Using the wrong oil can damage your engine. Consult your owner's manual or a mechanic for definitive advice.