Exam 13: Lubrication

Name three oil additives that affect engine wear.

Technician A says pleated paper is generally used in bypass oil filters. Technician B says a relief valve that is stuck closed will result in high oil pressure at idle. Who is right?

Technician A says that when oil oxidizes it becomes heavier and forms varnish deposits. Technician B says that in-town driving is easier on the engine than driving on the freeway. Who is right?

When an oil is tested at 0°F (-18°C), what letter will appear in the viscosity listing on the oil container?

Technician A says that detergents and dispersants keep small particles suspended in the oil so that the filter can filter them out. Technician B says that detergents clean the surfaces within the engine. Who is right?

Technician A says that full-flow oil filters have a minimum resistance to oil flow compared to bypass filters and are not designed to filter out sludge. Technician B says that bypass oil filters are used in heavy-duty applications, primarily to provide filtration in addition to a full-flow filter. Who is right?

Oil pumps are being discussed. Technician A says gerotor pumps are used on OHC engines. Technician B says the gerotor pump has an uneven pumping action. Who is right?

Technician A says most manufacturers recommend a minimum of 25 psi of oil pressure for every 1000 rpm. Technician B says short trips allow sludge to accumulate. Who is right?

Oil is being discussed. Technician A says oil never wears out. Technician B says there are many additives in oil that will become depleted during engine operation. Who is correct?

What does SAE stand for?

When removing an oil filter, position an oil filter wrench at the _____ end of the filter.

Technician A says that too much oil pressure can cause excessive oil consumption. Technician B says that viscosity goes up (oil becomes thicker) with lower temperatures. Who is right?

Technician A says that the "W" in SAE 10W-40 stands for "weight." Technician B says that SA, or "nondetergent," oil should not be used in late-model automobiles. Who is right?

Technician A says when oxygen is mixed with oil, it will extend the life of the oil. Technician B says excessively rich air-fuel mixtures can turn the oil black. Which technician is correct?

What are the two base stocks for synthetic engine lubricants?

An oil is rated at 10W-40. The "W" means winter grade.

What could be indicated by low oil pressure at idle?

Technician A says the primary job of antiwear additives is to protect the camshaft and lifters. Technician B says ZDDP has been commonly used as an antiwear additive. Who is correct?

Excessive clearance at a main bearing will result in low oil pressure at the rocker arms or valve lifters.

Technician A says that a full-flow oil filter will bypass some of the oil under cold running conditions. Technician B says that a full-flow oil filter can bypass some of the oil during high-speed operation. Who is right?