One indication of a problem in your engine is the color of your engine oil. Instead of a golden or amber color that's present with fresh oil, you'll see a dark black consistency, indicating you're ...

Aside from checking your engine oil levels, you should also look at the color and viscosity of your engine oil to see if it's still good enough to use or if you need to change it. Besides that ...

Inspect the oil level and quality using the dipstick. Clean oil should be amber in colour; dark or gritty oil suggests ...