5. what is the purpose of the oil sending unit?
a. to communicate with the high/low oil pressure gauge on the dashboard.
b. to indicate problems in the system when oil is circulating.
c. both a and b.
6. how does a clogged oil filter affect the oil sending unit?
7. how does a low oil level affect the oil sending unit?
8. engine viscosity is determined by the ____________ of the engine oil.
9. what do we call that part of the lubrication system that filters dirt and small metal particles.
10. explain how a 5w-20w weight oil changes thickness (viscosity) in 2007 ford, f-150 engine.

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Accepted Answer

### Question 5
# Brief Explanations:
The oil sending unit (oil pressure sensor) communicates with the oil pressure gauge on the dashboard to show pressure and also indicates system problems during oil circulation (like low pressure due to issues). So option c (Both a and b) is correct as a is about communicating with the gauge, b is about indicating problems during oil circulation, and the sending unit does both.
# Answer:
c. Both a and b

### Question 6
# Brief Explanations:
A clogged oil filter restricts oil flow, increasing oil pressure upstream (near the filter/sending unit). The oil sending unit measures pressure, so a clogged filter can cause it to detect higher than normal pressure (or erratic pressure if flow is severely disrupted), potentially triggering false low - pressure warnings or inaccurate readings as the restricted flow affects the pressure the sending unit senses.
# Answer:
A clogged oil filter restricts oil flow, which can increase oil pressure upstream (near the sending unit), causing the oil sending unit to detect higher - than - normal pressure (or erratic pressure), potentially leading to inaccurate pressure readings or false low - pressure warnings.

### Question 7
# Brief Explanations:
A low oil level means there's less oil to circulate. With less oil, the oil pump may not be able to maintain proper pressure, and the oil sending unit will detect lower oil pressure (since there's insufficient oil to create the normal pressure in the system). This can lead to the sending unit sending a signal indicating low oil pressure to the gauge or warning system.
# Answer:
A low oil level reduces the amount of oil available for circulation. This causes the oil pump to be unable to maintain normal oil pressure, and the oil sending unit will detect and signal lower - than - normal oil pressure.

### Question 8
# Brief Explanations:
Engine oil viscosity is determined by the temperature of the engine oil (and also its chemical composition/grade, but temperature is a key factor). As temperature changes, the viscosity of the oil changes (e.g., oil thins as temperature increases and thickens as it decreases). The "weight" or grade of the oil (like 5W - 30) is also related to its viscosity characteristics at different temperatures.
# Answer:
temperature (and chemical composition/grade of the oil)

### Question 10
# Brief Explanations:
The "5W - 20" (note: it's 5W - 20, not 5W - 20W) oil grade has a "W" (winter) rating. The "5W" means at low temperatures (like cold starts), the oil has a viscosity equivalent to a 5 - weight oil (it's thin enough to flow and lubricate easily in cold conditions). As the engine warms up (temperature increases), the oil's viscosity changes according to its formulation. The "20" means at the normal operating temperature of the 2007 Ford F - 150 engine (around 195 - 220°F or 90 - 105°C), the oil has a viscosity equivalent to a 20 - weight oil. The oil's additives and base stock are designed so that it thins as temperature rises (from cold to operating temp) but still provides adequate lubrication at both low and operating temperatures.
# Answer:
A 5W - 20 (correcting from 5W - 20W) weight oil is a multi - grade oil. The "5W" indicates its viscosity at low (cold) temperatures: it has a viscosity similar to a 5 - weight oil, meaning it is thin enough to flow easily during cold starts in the 2007 Ford F - 150 engine, ensuring proper lubrication of cold engine components. As the engine warms up to its normal operating temperature, the oil's viscosity changes (thins) due to the temperature increase, and at operating temperature, it has a viscosity equivalent to a 20 - weight oil. The oil's chemical formulation (additives and base stock) allows it to maintain adequate lubricating properties across the range of temperatures the engine experiences, from cold start to normal operation.

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