In relation to preventive maintenance of the engine lubrication system, which of the following operations is correct?

Question

DentroTest · Accepted Answer

To check the oil level reliably with the dipstick, the vehicle must be on a flat, level surface, with the engine off and cold (or after it has been left to rest long enough). This ensures that all of the lubricant has drained down into the sump, allowing an accurate reading. If it were checked with the engine hot or just switched off, part of the fluid would still be spread through the ducts and the cylinder head, showing an incorrectly low level. Conversely, draining and changing the oil must be done with the engine hot, because heat lowers its viscosity, so that it flows out quickly and carries away the impurities and sludge that have settled.

In relation to preventive maintenance of the engine lubrication system, which of the following operations is correct?

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