Engine Lubrication
4 LessonsLearn oil systems, viscosity, and why proper lubrication is the difference between 100K and 300K miles.
Overview
Oil is the lifeblood of the engine. This module covers oil pump design, oil passages, filtration, viscosity ratings, synthetic vs. conventional, and the variable valve timing systems that depend on clean, properly pressured oil to function.
Key Components
- Oil pump and pickup
- Oil filter and bypass valve
- Main and rod bearings
- Oil galleries and passages
- Variable valve timing oil control valves
How It Works
The oil pump draws oil from the pan, pressurizes it, and sends it through the filter and galleries to every bearing surface, cam journal, and moving part in the engine. Proper viscosity ensures the oil film prevents metal-to-metal contact under all operating conditions.
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Join the Nation — FreeCommon Problems
- Low oil pressure from worn pump or bearings
- Sludge buildup from extended drain intervals
- VVT solenoid failures from dirty oil
- Oil consumption from PCV system issues
Diagnostic Tips
- Oil pressure gauge test is more reliable than the dash light
- Cut open the oil filter and inspect the media
- Dark oil is not necessarily bad — smell it for fuel dilution
- Check PCV system before diagnosing oil consumption
Related Systems
Engine Mechanical
12 LessonsUnderstand how internal combustion engines work — from the block to the valvetrain.
Engine Cooling System
7 LessonsMaster cooling system diagnosis — from thermostats to head gaskets.
Fuel System
6 LessonsUnderstand fuel delivery from tank to injector — GDI, port injection, and everything in between.
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