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2. Head gasket - Wikipedia

   en.wikipedia.org/wiki/Head_gasket

   If the combustion gases are leaking into the cooling system, this reduces the effectiveness of the cooling system and can cause the engine to overheat. In other occurrences the gases can leak into small spaces between the gasket and either the cylinder head or engine block traps those gases, and then released when the engine is turned off.

3. 5 Oil Change Scams That Will Cost You Money - AOL

   www.aol.com/5-oil-change-scams-cost-150242957.html

   You already know oil changes cost you time and money -- but they could end up costing you lots of dollars and maybe even your car. Consider: 10 New Cars To Avoid Buying in 2024 I Have Driven Over ...

4. Fuel saving device - Wikipedia

   en.wikipedia.org/wiki/Fuel_saving_device

   For example, if an automobile typically gets 20 miles per US gallon (12 L/100 km) with a 20% efficient engine that has a 10:1 compression ratio, a carburetor claiming 100 mpg ‑US (2.4 L/100 km) would have to increase the efficiency by a factor of 5, to 100%. This is clearly beyond what is theoretically or practically possible.

5. Motor oil - Wikipedia

   en.wikipedia.org/wiki/Motor_oil

   An oil pump, a vane or gear pump powered by the engine, pumps the oil throughout the engine, including the oil filter. Oil filters can be a full flow or bypass type. In the crankcase of a vehicle engine, motor oil lubricates rotating or sliding surfaces between the crankshaft journal bearings (main bearings and big-end bearings) and rods ...

6. Engine tuning - Wikipedia

   en.wikipedia.org/wiki/Engine_tuning

   Engine tuning is the adjustment or modification of the internal combustion engine or Engine Control Unit (ECU) to yield optimal performance and increase the engine's power output, economy, or durability. These goals may be mutually exclusive; an engine may be de-tuned with respect to output power in exchange for better economy or longer engine ...

7. Oil additive - Wikipedia

   en.wikipedia.org/wiki/Oil_additive

   Although PTFE has been called "the slickest substance known to man", [15] [16] it would hardly do any good if it remains in the oil filter. Some mass-market engine oil additives, notably the ones containing PTFE/Teflon (e.g. Slick 50) [17] and chlorinated paraffins (e.g. Dura Lube), [18] caused a major backlash by consumers; the U.S. Federal ...