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Precision oil condition monitoring for heavy-duty diesel engines – The OEM 365C-3800030 Oil Sensing Plug is engineered to provide real-time oil level, temperature, and dielectric constant readings, enabling predictive maintenance and preventing costly engine damage. Designed for SINOTRUK Homan trucks, this intelligent plug replaces standard drain plugs with a smart sensor. For guaranteed compatibility and performance, always choose genuine Sinotruk Homan parts.
The 365C-3800030 features a built-in thermistor and capacitance sensor sealed in a corrosion-resistant stainless steel housing, with an IP69K-rated electrical connector for harsh underbody environments.
The 365C-3800030 oil sensing plug combines three critical sensors in one compact M22 x 1.5 threaded housing: a capacitance-based oil level sensor, a precision NTC thermistor (-40°C to +150°C), and a dielectric constant sensor that detects oil degradation (water contamination, fuel dilution, soot loading).
Unlike traditional dipsticks or basic level switches, this intelligent plug transmits continuous data via a 3-wire CAN J1939 interface, allowing the ECU to trigger warnings before damage occurs. The sensor is factory-calibrated for diesel engine oil (SAE 15W-40) but adapts automatically to other viscosities.
The plug body is machined from 316 stainless steel with a neodymium magnet integrated into the tip to capture ferrous wear particles. This dual-purpose design replaces both the drain plug and a separate magnetic plug, reducing potential leak points.
Measures oil level, temperature, and dielectric constant (water/fuel contamination). Provides early warning of coolant leaks or fuel dilution.
Rare-earth magnet on the sensor tip captures ferrous wear debris for analysis. Simplifies oil sampling during routine changes.
Direct communication with vehicle ECU or telematics gateway. Programmable warning thresholds for oil level and contamination.
| OEM Number | 365C-3800030 |
| Product Name | Oil Sensing Plug (Smart Drain Plug with Sensors) |
| Brand | SINOTRUK Homan |
| Thread Size | M22 x 1.5 (standard oil pan drain port) |
| Sensor Type | Capacitance (level), NTC thermistor (temp), Dielectric constant (contamination) |
| Output Signal | CAN J1939 (250k or 500k baud) – 3-wire (power, ground, CAN H/L) |
| Power Supply | 9-32V DC (12V/24V systems), reverse polarity protected |
| Current Consumption | ≤ 40 mA @ 24V |
| Oil Level Range | 0-80 mm from tip (accuracy ±2 mm) |
| Temperature Range | -40°C to +150°C (accuracy ±1°C) |
| Dielectric Range | 1.0 to 3.5 (0=water, 2.2=good oil, >3.0=fuel dilution) |
| Housing Material | 316 stainless steel with magnetic tip (NdFeB, 50mT) |
| Connector Type | Deutsch DT04-3P (IP69K, mating connector included) |
| Seal | Copper crush washer (included) or optional Viton O-ring |
| Operating Pressure | ≤ 5 bar (max oil pressure at plug location) |
| Ingress Protection | IP69K (sensor body), IP67 (connector mated) |
| Compatible Fluids | Engine oil (mineral, synthetic), transmission oil, hydraulic oil |
| Compatible Models | SINOTRUK HOWO, A7, T7H, C7H (all with M22 drain ports) |
The 365C-3800030 integrates a proprietary capacitive array that measures oil level by detecting the dielectric difference between air (ε≈1) and oil (ε≈2.2-3.0). The sensor is compensated for oil temperature automatically using the built-in thermistor, ensuring accurate level readings regardless of viscosity changes.
The dielectric sensor continuously measures the permittivity of the oil. When coolant leaks into the oil (water has ε≈80), the reading spikes immediately, giving an early warning of head gasket or cooler failure. Fuel dilution (e.g., from leaky injectors) also raises the dielectric value before viscosity drops detectably. The CAN output includes a “contamination index” (0-100%) that can trigger dashboard warnings.
The magnetic tip attracts ferrous particles larger than 30 microns, collecting them on a removable sleeve. During oil changes, the magnet can be cleaned and the debris analyzed for bearing or gear wear patterns – a built-in condition monitoring tool.
All external surfaces of the 365C-3800030 are 316 stainless steel (not plated carbon steel), providing absolute resistance to road salts and acids from oil degradation. The internal electronics are potted in a high-temperature epoxy, preventing moisture ingress and vibration damage.
The Deutsch connector is industry-standard and includes a rubber seal and locking latch. A mating pigtail harness with 30cm flying leads is supplied with each plug for easy splicing into vehicle wiring.
The 365C-3800030 replaces the standard M22 drain plug directly. No modifications to the oil pan are required. It is compatible with SINOTRUK Homan engines (WD615, WD618, MC11, MC13) and transmissions (HW19710, etc.) that use the same thread.
For trucks without a CAN bus, an optional 4-20mA analog converter module is available. Otherwise, the plug outputs standard J1939 messages (PGN 0x00FEF2 for fluid level, PGN 0x00FEF5 for temperature, PGN 0x00FEF8 for dielectric). Simple configuration via free software (USB adapter sold separately).
Installing the 365C-3800030 is straightforward: 1) Drain the oil pan. 2) Remove the existing M22 drain plug and clean the threads. 3) Install the new copper crush washer onto the sensor plug.
4) Thread the sensor plug into the pan by hand until snug, then torque to 40 Nm (do not overtighten). 5) Route the pigtail harness away from hot exhaust components and secure with cable ties. 6) Connect the 3 wires: +24V (or +12V) to vehicle power, ground to chassis, and CAN H/L to the diagnostic port or ECU.
7) Refill oil to the correct level. 8) Power up the vehicle – the sensor will self-calibrate the zero level within 10 seconds. 9) Verify communication using a diagnostic tool or the dashboard oil level display (if equipped).
The 365C-3800030 requires no scheduled maintenance, but the magnetic tip should be cleaned at every oil change. Use a lint-free cloth to wipe off collected debris, and inspect for large metal particles (which indicate advanced wear).
If the sensor fails to communicate, check the CAN termination resistors (the plug has none; it must be connected to an existing bus). A missing ground or low voltage (below 9V) can cause erratic readings. The unit has built-in diagnostic LED (visible only when removed) that flashes codes: 1 flash = power OK, 2 flashes = CAN error, 3 flashes = sensor fault.
Do not use a hammer or impact wrench to install – the ceramic substrate inside can crack. Always hand-start the threads to avoid cross-threading. The plug is reusable indefinitely; only the crush washer should be replaced each time.
The 365C-3800030 is manufactured in an ISO 9001:2015 and IATF 16949 certified facility. Each unit undergoes 100% functional test: level calibration (using calibration fluid), temperature sweep from -40°C to +150°C, dielectric check with reference oil, and high-pot insulation test (500V DC).
Random samples are subjected to a 500-hour vibration test (20g, 10-2000 Hz), 1000-hour thermal cycling (-40°C to +150°C), 480-hour salt spray (ASTM B117), IP69K steam jet testing, and a 200,000 km road durability trial. The sensor meets ECE R10 (EMC) and RoHS 3 directives.
A laser-etched serial number on the hex face allows complete traceability. Counterfeit units often lack the integrated magnet or use low-quality epoxy that cracks – always verify the QR code on the packaging.
A fleet of 120 SINOTRUK T7H trucks in Australia (high dust, extreme heat) equipped with the 365C-3800030 reported a 40% reduction in engine overhauls over 2 years. The sensor detected three slow coolant leaks before any bearing damage occurred, saving over $90,000 in repairs.
Another user – a construction rental company – installed the oil sensing plug on 200 HOWO dump trucks. They reduced unplanned downtime by 70% and extended oil drain intervals from 25,000 km to 40,000 km by using the contamination index to determine true oil life. The magnetic tips collected significant debris, allowing early detection of a batch of faulty bearings.
Each genuine 365C-3800030 oil sensing plug is packed in a foam-lined carton. The kit includes the sensor plug, copper crush washer, Deutsch mating connector with 30cm pigtail, and a quick-start guide with QR code for online calibration certificates.
The plug has a high-resolution QR code on the hex head – scanning it takes you to the SINOTRUK Homan verification portal with the unit’s unique calibration data. Counterfeit plugs often have no magnetic tip or contain a simple thermistor only (no capacitance or dielectric sensing).
Always purchase from authorized distributors. Using a fake oil sensor can lead to missed low-oil warnings, catastrophic engine seizure, or worse – and it will void your engine warranty.
Summary: The SINOTRUK Homan Oil Sensing Plug (OEM 365C-3800030) delivers real-time oil level, temperature, and contamination data, enabling predictive maintenance and extending engine life. Upgrade your fleet with this smart sensor – trusted by professionals worldwide for reliability and insight.
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