What are the disadvantages of high oil viscosity?

[SanElaina]

Lubricating oil with excessive viscosity can lead to the following issues: High viscosity of lubricating oil results in poor fluidity, causing excessively high pressure at the oil pump outlet and an increase in the lubricating oil system pressure. It is advisable to adjust the lubricating oil pump, regulate the oil pressure, or blend in low-viscosity oil. When the oil pressure regulating valve fails, it should be repaired or replaced promptly. Oil may seep into the intake pushrods from the camshaft oil passages and mix into the combustion chamber to be consumed. When the viscosity is too high, the oil circulation rate decreases, leading to reduced cooling effectiveness and the formation of sludge and deposits. High viscosity results in a high friction coefficient, increased engine power loss, reduced output power, and higher fuel consumption.

[CharlieFitz]

I've encountered quite a few troubles when using engine oil with excessively high viscosity. Firstly, it significantly increases fuel consumption because the engine requires more effort to start and operate with this sticky oil, leading to higher fuel costs over time. Cold starts in winter are particularly painful - the oil flows poorly at low temperatures, making the starter motor labor hard. There were several instances when it took multiple attempts to get the engine running, which was terribly inconvenient. Moreover, internal engine wear intensifies as the oil film provides insufficient lubrication, potentially damaging components and even shortening engine lifespan in the long run. Additionally, emissions increase, and failing to meet exhaust standards might affect annual inspections. In conclusion, I strongly recommend selecting the proper viscosity as specified in the vehicle manual, rather than trying to save money or cut corners.

[DelMackenzie]

I think high oil viscosity has quite a few drawbacks. You can immediately feel the fuel consumption skyrocket when driving - the engine has to work harder against the thick oil, resulting in burning more fuel and monthly gas bills exceeding the budget. Cold starts become a real pain, with the oil flowing as slow as glue, making the starter struggle and causing delayed ignition for several minutes. Plus, lubrication effectiveness decreases, increasing friction between engine components, which may lead to abnormal noises or even serious damage over time. I once used the wrong oil, and switching to the correct one made a world of difference. I recommend regularly checking oil specifications to avoid unnecessary expenses and repairs.

[DiBrady]

Using engine oil with excessively high viscosity can indeed cause problems. The most noticeable issues include increased fuel consumption, greater resistance during engine operation, and lower fuel efficiency. Additionally, it can lead to difficulties in starting the engine, especially in cold weather. Over time, insufficient lubrication accelerates wear and tear, making parts more prone to damage. Emissions may also increase. It's best to switch back to the appropriate engine oil.

[SophieMarie]

I have a deep understanding of the drawbacks of high oil viscosity. Fuel consumption will skyrocket, and the fuel gauge drops rapidly during long-distance driving, costing significantly more money each month. Winter starts are particularly troublesome—the oil is too thick for the starter motor to turn, requiring repeated ignition attempts. Poor lubrication leads to increased wear and shortens engine life. It also increases pollutant emissions, which is bad for the environment. I recommend regularly checking the oil condition, avoiding incorrect grades, and changing the oil promptly.

[DiZoe]

Using engine oil with excessively high viscosity has taught me a lesson. Firstly, fuel consumption increases by a significant margin, putting pressure on the wallet due to frequent refueling. Secondly, starting the car becomes difficult—during cold spells, the car stubbornly refuses to ignite, causing delays for work. Insufficient lubrication accelerates engine wear and may even seize critical components like pistons. Increased emissions affect environmental tests and could lead to fines. After switching to the recommended viscosity oil, my car's condition stabilized significantly, saving both hassle and money.