Does the 2018 CS75 280T have engine oil dilution issues?

[NaomiAnn]

Changan CS75 2018 model is equipped with China's Top 10 Engine - the independently developed BlueCore engine by Changan. This engine technology is mature and reliable, and will not experience engine oil dilution issues. The reasons for solving the oil dilution problem are: 1. The 2018 Changan CS75 is equipped with a Delphi high-pressure common rail direct injection system, which plays a significant role in improving oil dilution. 2. From a technical perspective, the application of this system can increase the number of fuel injections per stroke in the cylinder, making gasoline atomization more thorough, thereby solving the oil dilution phenomenon. Below is a detailed introduction to the new Changan CS75: The new Changan CS75 adopts Changan's latest family design language, with a completely different exterior styling from the current model. The front features a large inverted trapezoidal grille with multi-horizontal chrome trim, more refined headlight construction with LED lighting. The rear of the car adopts a full-width taillight design, and the rear bumper has been revised. The dual exhaust layout further enhances the youthful and dynamic feel of the vehicle. The interior features Changan's latest family-style design, equipped with a floating central control screen, full LCD instrument panel, and a three-spoke multifunction steering wheel. Numerous chrome elements around the air vents, steering wheel, and gear lever enhance the car's premium feel.

[LucilleDella]

The 2018 CS75 280T did indeed receive numerous complaints about engine oil dilution. I've personally come across many such cases. The issue primarily occurred with the 1.5T BlueCore engine during short-distance driving in cold conditions, where gasoline would mix into the engine oil, causing the fluid level to rise. My neighbor fell victim to this - with insufficient warm-up time on winter mornings, they discovered the oil level above the max mark on the dipstick with a distinct gasoline smell after just two months of driving. Changan later issued a recall notice, offering free ECU upgrades and coolant hose replacements for 250,000 affected vehicles. The new engine models now feature an improved fuel injection system. For owners of older models, it's advisable to regularly check the dipstick. If you detect gasoline odor or emulsification in the oil, visit an authorized service center immediately for software updates.

[DeLucy]

As someone who has repaired over a dozen CS75s, the 280T engine oil dilution issue mainly occurred in the 2017-2018 batches. The principle is quite simple: during cold starts of the direct-injection engine, poor fuel atomization from the injectors causes gasoline to flow down the cylinder walls into the oil pan. Last year, I tested for an owner - in sub-zero temperatures with frequent short trips, the oil level could rise by 5mm over 1,000km. Changan's solution was to adjust the fuel injection strategy to warm up the engine faster. The key lies in driving habits - don't try to save fuel in winter. Wait until the RPM drops below 1,000 after starting before driving off, and taking longer trips helps evaporate the mixed-in gasoline.

[VanAdriana]

I remember this was the most heated issue in our car owners' group back in 2018. Out of over 400 members in the northern car owners' group, more than 30 reported exceeding oil limits, characterized by milky white foam on the oil cap. After the manufacturer's recall, we compared and found: after the ECU upgrade, cold start RPM increased to 1500, resulting in more complete combustion; the newly designed crankcase ventilation tube was thickened by 30%, allowing faster exhaust gas circulation. For those driving older cars over five years now, it's recommended to check the dipstick every 5,000 kilometers. If the oil level keeps rising, switch to higher viscosity 5W-40 oil, which has better anti-dilution properties than the factory 5W-30.

[SadieAnn]

This issue has two sides: design flaws do exist, but ambient temperature plays a bigger role. The complaint rate in Heilongjiang's -20°C regions is seven times higher than in Guangzhou. The accumulated issue occurs when the engine shuts off before the mixed gasoline has evaporated. My own 280T model ran for six years in southern China without any oil dilution, but it happened during a two-week business trip to Harbin last year. The solution is actually simple: if you drive in prolonged low-temperature areas, don't turn off the engine immediately after parking—wait for the turbo temperature to drop first. There's also a hidden trick: reduce the maintenance interval from 10,000 km to 8,000 km.

[Holden]

The essence of oil dilution is gasoline entering the crankcase. The piston rings of the 280T engine have insufficient sealing performance at low temperatures, especially noticeable during short-distance commutes below -10°C. The last disassembly revealed that the improved piston rings have a reduced end gap by 0.1mm, but owners of older vehicles should pay attention to three points: do not fill oil beyond the midpoint of the upper limit mark, switch to full-synthetic low-volatility oil, and deeply press the accelerator a few times each month to let the engine run at high temperature for ten minutes. If the oil level exceeds the upper limit mark by 1cm, immediate action is required to prevent potential camshaft wear.