Diesel engine systems have what type of LO filtering capabilities?

• A. Full flow
• B. Partial flow
• C. Magnetic only
• D. By-pass

Answer: (A)

Full-flow filtration is used in most diesel engine lubrication systems, meaning every drop of lubrication oil passes through the filter before it reaches bearings and other moving parts. This ensures contaminants like dirt and metal wear debris are removed from all oil circulating through the engine, protecting surfaces and extending life. Partial-flow filtration would leave a portion of the oil unfiltered, risking wear in critical areas. Magnetic filtration only removes ferrous particles and doesn’t address nonmagnetic contaminants, so it isn’t sufficient as the sole LO filter. A bypass path allows some unfiltered oil to circulate, which is not the standard method for providing complete protection. Thus, the lubrication oil filtering capability is full-flow.