December 9, 2022
oil in the running engine

An ordinary motorist has no idea to what temperatures the oil in the running engine of his car warms up. And you need to know this, because under certain conditions the lubricant can lose its protective properties, which will lead to a major overhaul of the motor.

The average oil temperature in the engine reaches 90-105 degrees. Deviation from this norm entails unpleasant consequences for the power unit. At the same time, low rates of lubricant warm-up are less dangerous than high ones.

Typically, the flash point of the lubricant is indicated on the canister label. The manufacturer gives this indicator without fail, because each substance has its own boiling threshold. However, the better the additives, the less likely it is that the consumable will fail.

When they say “the oil boiled”, they mean that it began to bubble. This results in the formation of scale. It mixes with the deposits that are already in the engine and clogs the gaps between the parts, and also remains in the oil channels. And the lubricant itself is no longer able to perform protective functions. This is how scuffs appear in the engine, and in the worst case, the lubricant turns into black slurry and the unit breaks down.

Motorists found out that the dangerous high-temperature zone begins in the crankcase area after 150 degrees, in the piston ring zone – after 230 degrees, and in the cylinder head – at 310 degrees.

It seems that there is nothing to be afraid of, because many manufacturers indicate the ignition temperature of the oil – 230-240 degrees. However, real figures can be much lower – 150-190! It depends on the condition of the engine and its design. If the unit is with a pressurization system, and a hot exhaust pipe passes near the crankcase, then overheating of the lubricant can easily occur. And if they also saved on the lubricant, then trouble is almost inevitable.

In a traffic jam, such a motor quickly overheats, and the “slurry” loses its protective properties. Trouble can be recognized by the sounds of boiling, which are difficult to confuse with anything, or by the black exhaust. To avoid trouble, we advise you not to save on oil, and flush the unit with each lubricant change. So you can avoid overheating and extend the life of the “iron horse”.