The lubrication system of high-performance vehicles, especially turbocharged engines, is like the "cardiovascular system" of the human body and must use fully synthetic engine oil designed specifically for extreme working conditions. The following is the ultimate maintenance plan for turbocharged engines:

1、 The Four Great Purgatory Conditions of Turbocharged Engines

Hot Hell

The local temperature of the turbine bearing can reach 280-320 ℃ (gasoline engine)/400 ℃+(diesel engine)

Ordinary mineral oil will carbonize and block the oil passage at this temperature (measured carbonization rate increased by 300%)

Cut Hell

Mineral oil viscosity decreases by 40% within 30 hours

Insufficient shear stability of semi synthetic oil (HTHS ＜ 3.5mPa · s)

The shear force generated by a turbine speed of 150000 to 200000 revolutions per minute can

Pollution Hell

The fuel dilution rate of a direct injection engine can reach 5-8% (degraded oil speed x 2)

Sedimentary Hell

The piston top temperature of small displacement turbocharged engines is greater than 260 ℃, which is prone to the formation of hard carbon deposits

2、 Five dimensional selection criteria for high-performance turbine engine oil

1. Type of base oil

Must be fully synthesized: PAO+ester composite formula (ester content ≥ 20%)

Comparative test: PAO base oil has an evaporation loss of only 7% at 300 ℃ (mineral oil reaches 35%)

2. Certification standards

Car companies

Certification Number

Key requirements

Volkswagen/Audi VW50400 ash content ≤ 0.8% (protecting GPF)

BMW LL-04 HTHS ≥ 3.5mPa · s

Mercedes AMG 229.5 Turbo Cooling Special Test

3. Viscosity selection

New models (after 2018): 0W-20/5W-30 (with SP/GF-6A certification)

Old performance car: 5W-40/10W-60 (such as Porsche 997 GT3)

Track Day Exclusive: 15W-50 (such as Red Line Race Oil)

4. Additive technology

Wear resistant: Organic molybdenum+borate composite formula (superior to traditional ZDDP)

Cleaning: Polyether amine (PEA) content ≥ 1500ppm

Antioxidant: Phenolic ester additives (increase high-temperature durability by 4 times)

5. Special performance

Electrical resistivity ≥ 1 × 10 Ω· m (insulation requirement for hybrid vehicles)

Ash content ≤ 0.6% (essential for National VI B with GPF models)

3、 Special protection scheme for turbocharger

Pre lubrication strategy

Idle speed ≤ 30 seconds after cold start (standby oil pressure established)

Idle for 2 minutes after intense driving (to prevent turbine bearings from burning due to lack of oil)

Cleaning and maintenance

Use turbine specific cleaning agents (such as Liqui Moly Pro line) every 50000 kilometers

Check the efficiency of the intercooler (intake temperature should be less than 50 ℃)

Monitoring methods

Install an oil temperature/pressure gauge (the oil temperature of the turbine car should be less than 120 ℃)

Regularly check the iron content in engine oil (>80ppm requires investigation of turbine wear)

4、 Formula for calculating the oil change cycle of performance vehicles

Actual cycle=Basic cycle x Operating condition coefficient x Oil product coefficient

Basic cycle:

Street car usage: 15000km/year (compliant with car manufacturer certification)

Track Day: Change oil every 10 hours of track time

Operating condition coefficient:

Launch/Red Line Shift: x 0.7

Plateau region (>3000m): × 0.8

Oil coefficient:

Total synthesis of esters: 1.2

Ordinary PAO total synthesis: 1.0

case

Audi RS4 (factory recommended 15000km) twice a month on track days:

15000 × 0.7 × 1.2=actual period 12600km

5、 Turbine engine oil death red line

The following situations must be replaced immediately:

The engine oil has a caramel color (severe oxidation at high temperatures)

Changes in kinematic viscosity>± 15% (measured viscosity at 100 ℃)

Fuel dilution rate>5% (requires specialized testing equipment)

Turbine bearing clearance>0.1mm (accompanied by whistling sound)

6、 Recommended Top Performance Oil for 2024

Ultimate Track: Motul 300V 5W-40 (Double ester, containing nano tungsten)

Street King: Shell Helix Ultra 0W-20 (including PurePlus GTL technology)

Hybrid exclusive: Mobil 1 ESP 0W-30 (ash content 0.5%, ACEA C5）

Old car savior: Li Mo 4200 5W-50 (including Ceratec ceramic repair agent)

Engineer's advice:

The maintenance cost of turbocharged engines is 3-5 times that of naturally aspirated engines. The hundreds of yuan saved by using inferior engine oil may result in tens of thousands of yuan in turbine and cylinder overhaul bills. Identifying the triple guarantee of API SP+ACEA C6+automotive certification is the true "worry free way".