* Engine Variations: Even within the same model year and engine size, there can be different engine variations (like different engine codes). Each variation might have slightly different compression specs.
* Wear and Tear: Compression readings change over time as the engine ages. A brand new engine will have a higher compression than one with significant mileage.
* Maintenance History: How well the engine has been maintained (regular oil changes, etc.) also impacts compression.
What You Should Do:
1. Consult Your Owner's Manual: The best source for this information is your car's owner's manual. It will provide the specific compression specifications for your exact engine.
2. Check a Repair Manual: You can also find compression specifications for your Sentra in a repair manual (like a Haynes or Chilton manual).
3. Contact a Mechanic: If you can't find the information, your local mechanic can tell you the expected compression range for your engine.
Important: Don't just assume a general compression number will work. Accurate compression readings are vital for diagnosing engine health. If you have concerns about your engine, it's best to consult a professional.
