What Rear end gear oil in 1999 S-10?

The recommended rear differential gear oil for a 1999 Chevrolet S-10 depends on the type of rear axle you have. The S-10 came with several different options. To be certain, you need to check the sticker on the differential itself or your owner's manual. The sticker will indicate the type and capacity.

However, common choices for the 1999 S-10 are:

* 75W-90: This is a common general-purpose gear oil suitable for many applications. If your owner's manual doesn't specify otherwise, this is a good starting point. Look for gear oil that meets API GL-5 specifications.

* 75W-140: This is a heavier weight gear oil, often used in heavier-duty applications or in hotter climates or if you tow frequently. Again, check your owner's manual first.

Important: Using the incorrect weight or type of gear oil can damage your rear differential. Always consult your owner's manual or the sticker on the differential for the specific recommendations.

If you can't find the information on the vehicle or in the owner's manual, you can take the vehicle to a mechanic or parts store and they can identify the axle type and recommend the proper gear oil. They can also change the oil for you.