Includes an oil and filter change, checking fluid levels, tire inspections, and a general check of the truck's major components, aiming to prevent breakdowns and ensure safe operation.

Includes component inspection and repair, reassembly and testing, fluid level monitoring, pan cleaning/replacement, and sump/pan examination.

Includes routine checks and fluid changes to more extensive repairs or overhauls, all aimed to ensure the engine's optimal performance and longevity.