• Conventional - also called Regular or Standard, this oil type is the foundation of all engine oils. It is crude oil refined with additives and detergents that make it good for use within modern engines. It is recommended form many older-model Volkswagen and offers attractive value because of its lower relative price versus Synthetics.
• Synthetic - also called Full-Synthetic, this oil change type is entirely man-made and requires maximum refinement that helps it resist thermal breakdown for longer than conventional. It offers many VW models of attractive value due to its extended change schedule.
• Diesel - specifically for diesel-engine Volkswagen models, this oil change service is perfect for a diesel Jetta, Golf, Beetle, Passat, or Touareg with TDI engines.

When You Might Need an Oil Change

As engine oil starts losing viscosity due to thermal breakdown, it will begin changing in consistency and color. The change in texture and appearance demonstrates how engine oil is turning into sludge. When engine oil begins forming into a sludgy consistency, it can't lubricate the engine.

If the engine is not lubricated, it can cause secondary problems, such as engine overheating, rapid engine component wear, reduced fuel efficiency, and damages. Here are the most common symptoms related to thermal breakdown of engine oil:

Oil change light

Check engine light

Engine sounds louder than usual or has a knocking noise

Dirty, dark, or gritty oil

Black exhaust fumes

Mileage beyond the maintenance schedule