What is the general oil pressure for diesel engines?
2 Answers
Generally, the normal oil pressure for gasoline engines is 1.5-3.5 pressure, while for diesel engines, the oil pressure ranges from 3 to 5 pressure, which is considered normal, with idle speed around 1 pressure. Below is more information about engine oil: 1. Mineral oil: Mineral oil is the residue left after refining gasoline and heavy oil from petroleum. It is essentially a natural oil with more impurities, cheaper compared to semi-synthetic and full synthetic oils, but offers poorer lubrication for the engine and has a shorter service life. 2. Semi-synthetic oil: Semi-synthetic oil falls between mineral oil and full synthetic oil. It contains a large amount of anti-corrosion additives to enhance the stability and oxidation resistance of the oil. 3. Full synthetic oil: Among these three types, full synthetic oil offers the best quality and durability, and is also the most expensive. Typically, it can last for 10,000-12,000 kilometers in passenger cars without deteriorating. 4. Hazards of water in oil: If a small amount of water enters the engine and mixes with the oil, the oil quality deteriorates. Oil containing water increases wear on engine components, potentially leading to increased engine noise and vibration during future vehicle operation.
I've been driving diesel vehicles for over a decade. The oil pressure in diesel engines typically ranges between 10 to 20 psi at idle and can rise to around 30 to 70 psi while driving. These values are crucial. If the idle pressure drops below 10 psi, insufficient engine lubrication can lead to crankshaft or camshaft wear. Conversely, if the pressure exceeds 70 psi, it might indicate clogged oil passages or the need to replace the filter screen. I recall one winter when the pressure was unusually low; upon inspection, I found the oil was too thin. Switching to a thicker grade resolved the issue. I recommend getting a simple pressure gauge to periodically check the readings. If the dashboard warning light comes on, don't delay—stop immediately to check the oil level and quality. Diesel engines are more durable, but oil pressure issues shouldn't be ignored. Regular maintenance with the correct oil viscosity can save you significant expenses.
