Lubrication Science
How Oil Breaks Down Over Time
Oxidation, shear, fuel dilution, soot, moisture, and how service conditions drive degradation.
Quick Answer
Oil degradation is mostly about heat, contamination, oxidation, and usage severity.
Key Coverage
- Fuel dilution
- Oxidation
- Service severity
Guide Breakdown
How to use this page
Use the quick answer to confirm the core recommendation, then work through the coverage and highlights to decide how that advice applies to your vehicle, service interval, and operating conditions.
The most useful maintenance pages connect specification, operating context, and service procedure instead of treating maintenance as a single isolated choice.