Black oil means that it’s doing its job. One of the functions of oil is to dissipate the harmful by-products of combustion; this is what turns it black.
It’s impossible to tell visually when oil has lost its effectiveness.
The best recommendation is to change the oil according to the manufacturer’s recommendations.
You can also consult our oil change chart.
You can the oil of your choice to the dealership as long as it meets the API specification and the SAE viscosity recommended by the manufacturer. Read the owner’s manual to find the recommendation.
Make sure they stamp your maintenance log and they’ll have no grounds whatsoever to cancel your warranty should you need it.
The dealership can make a recommendation, but the final decision is always yours.
Viscosity is apparent, i.e., you can perceive it with your senses, but it has nothing to do with the type of oil your car needs or with the protection that the oil offers.
The best oil is the specification that the manufacturer or a certified expert recommends.
Combustion in a diesel engine is by compression while combustion in a gasoline engine is by ignition.
While similar, the processes are different, as are the engine components. They also give off different contaminants.
Since oil is an element that interacts with most of the engine’s moving parts during combustion, we recommend that you use the right oil for your vehicle type.