#oil
6 posts in Car Diagnostics blog about "oil" — OBD-II diagnostics, DTC codes, repair. ← All posts
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P3400: cylinder deactivation system and the lifters that fail
Shutting off half the cylinders saves fuel and adds a mechanism that fails in a specific, expensive way. Oil condition is what decides which you get.
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The oil filter: the wrong place to save money
A cheap filter saves a few coins and, in the bad case, costs an engine. What is inside and why the valves matter more than the can.
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The engine uses oil: where normal ends and a fault begins
Manufacturers allow oil consumption, and that is not an excuse. Where the line is, how to tell burning from leaking, and what diagnostics shows.
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Oil change intervals: why the schedule and reality disagree
The schedule was not written for your route. What "severe conditions" means, why it applies to most drivers, and how to work out an honest interval.
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Choosing engine oil: why the approval matters more than viscosity or brand
A bottle carries three groups of markings and they are not equivalent. Viscosity says how the oil flows. The approval says whether it suits your engine. Confusing them costs a particulate filter or a cam phaser.
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Oil Leaking Under the Engine: 10 Leak Points and How to Pinpoint
Found an oil stain under the car: how to identify in 20 minutes which gasket or seal is leaking, and how much repair costs.