Choosing the right lubricant for Japanese cars always causes controversy among car owners. Many owners Nissan Qashqai or X-Trail looking for a compromise between cost and engine protection, paying attention to the viscosity class 5W40. This category of oils has become a kind of standard for used cars or operating in variable climate conditions.
The viscosity of 5W40 provides a balance between easy starting in cold weather and maintaining a protective film at high temperatures. For engines MR20DE or QR25DE this parameter is often optimal, especially if the car’s mileage has already exceeded 100 thousand kilometers. It is important to understand that original manufacturer fluids often change their specifications, and 5W40 may be more relevant for certain regions.
Physico-chemical properties and purpose of viscosity 5W40
Understanding the markings on the canister is the first step to long life for your motor. The number 5 before the letter W indicates low-temperature viscosity, which means the engine can be started at temperatures down to -30°C. This is critically important for winter operation in the middle zone or northern regions of Russia, where sudden temperature changes test the strength of parts.
The second number, 40, characterizes the high-temperature viscosity, that is, the thickness of the oil film at an operating temperature of 100°C. For turbocharged engines such as 1.6 DIG-T, this value provides sufficient protection of the turbine bearings from rotation and wear. If you use thinner oil, for example 5W30, in older units, the pressure in the system may drop to critical values.
Dynamic viscosity and viscosity index are key indicators that determine how quickly the oil will flow into the sump when stopping and how quickly it will rise to the friction units when starting. High-quality 5W40 oil has a high viscosity index, which allows it to remain stable both at -25°C and when overheated in traffic jams.Specifications and approvals for Nissan engines
Original oil from Nissan often has ACEA A3/B4 or API SN/SM specifications. These standards ensure that additives in the fluid do not harm the catalyst and particulate filter (if provided for in the design). However, for gasoline engines with direct fuel injection, the oil requirements may be stricter than for conventional naturally aspirated engines.
For diesel versions such as YD25DDTi, access ACEA C3 is a prerequisite. This is due to the presence of an exhaust gas neutralization system. Using oil without proper supplementation can lead to rapid filter clogging and costly repairs to the exhaust system.
The table below provides a comparison of the main characteristics of oils suitable for most models in the line:
| Parameter | Value for 5W40 | Effect on the engine |
|---|---|---|
| Kinematic viscosity at 100°C | 13.5 - 16.3 mm²/s | High load protection |
| Pour point | -35°C ... -42°C | Easy start in winter |
| Base number | 8.0 - 10.0 mgKOH/g | Acid neutralization and cleanliness |
| Flash point | 220°C ... 235°C | Volatility and fire safety |
Original versus analogues: what to choose?
Many owners Nissan Almera or Sentra They are wondering: is it worth overpaying for a canister with the manufacturer’s logo? Original oil Nissan Motor Oil 5W40 produced by major chemical giants such as ExxonMobil or Idemitsu and undergoes strict quality control. This guarantees the absence of counterfeits and compliance with the declared characteristics, which is especially important during warranty service.
However, the market of analogues offers a worthy alternative, often superior to the original in terms of a set of additives. Brands like Liqui Moly, Shell Helix or Castrol have their own technologies of detergent and dispersant additives that better wash out carbon deposits from old engines. The main condition is the availability of current certificates of conformity.
- Original Nissan
- Major brands (Shell, Mobil)
- Premium analogues (Liqui Moly)
- Budget options
Do not blindly trust advertising and choose oil only based on price. Cheap analogues often have a low base number, which leads to rapid oxidation of the oil and the formation of sludge. Given the conditions of Russian roads and fuel quality, this can be fatal for engine life. MR18DDT.
⚠️ Attention: Buy oil only from official dealers or large chain stores. The market for counterfeit oils Nissan is huge, and it is almost impossible to distinguish a low-quality fake from the original by the appearance of the canister.
Features of operation in various climatic conditions
Viscosity 5W40 is universal for most regions, but there are nuances. In harsh winter conditions, when temperatures remain consistently below -30°C, oil may thicken faster than expected. In such cases, it is recommended to switch to more liquid grades, for example 0W30, if engine mileage allows.
In summer, at extreme temperatures above +35°C, the density of 5W40 becomes an advantage. The thin film of 5W30 can break down when running at high speeds for long periods of time, such as when overtaking or driving uphill with a full load. For Nissan Patrol or Pathfinderwhich are often used in harsh conditions, 5W40 is a reliable choice.
Before the onset of winter, be sure to check the condition of the oil filter. Even the highest quality oil will not be able to work effectively if the filter is clogged and does not allow the required amount of fluid to pass through the lubrication system.
DIY oil change instructions
The process of changing the oil is not difficult, but it requires care and consistency of actions. You will need a tool kit, a new 4-5 liter oil canister and a new oil filter. For turbine models such as Qashqai 1.2 DIG-T, the procedure may take a little longer due to access to the filter.
☑️ Preparation for replacement
The first step is to warm up the engine to operating temperature so that the oil becomes less viscous and drains better. Then you need to place the car on a lift or inspection hole, remove the crankcase protection and unscrew the drain plug. Be careful, the oil is hot!
After completely draining the old oil, the oil filter must be replaced. Before installing a new filter, be sure to lubricate the O-ring with fresh oil. This will prevent distortion and ensure a tight connection. Tighten the filter by hand until it stops, without using tightening tools.
Why can't you tighten the drain plug?
If you overtighten the plug, you can strip the threads in the oil pan. Repairing the pallet in this case will be very expensive, since it often requires replacing the entire part or complex welding.
Fill in new oil through the neck, checking the level with the dipstick. Do not fill the entire volume at once, it is better to add a little less than the norm, start the engine for a couple of minutes, turn off and check the level again. Top up to the MAX mark.
Proper oil change is not only about changing the fluid, but also checking the condition of the seals, drain plug and filter. Skipping any step may result in leaks or loss of oil pressure.
Replacement frequency and service intervals
Factory regulations often indicate a replacement interval of 15,000 km, but this is only true for ideal operating conditions. In reality, taking into account traffic jams, short trips and fuel quality, the interval should be reduced to 8,000 - 10,000 km. This is especially true for engines with direct fuel injection.
For cars with high mileage, where oil consumption is low, the level should be checked every 1000 km. If the level drops quickly, this may indicate wear on the piston rings or valve seals. In such cases, using thick 5W40 oil may temporarily compensate for the problems, but will not solve them.
Keep an oil change log. Record the date, mileage and name of the oil filled. This will help track the dynamics of consumption and notice deviations in engine operation in time.
Common mistakes when choosing and using
One of the most common mistakes is mixing oils from different manufacturers and types. Even if both oils have a viscosity of 5W40, their additive package may be incompatible. This leads to sedimentation, clogging of channels and rapid oxidation of the mixture. Never add another oil unless it is possible to drain the old one completely.
Another mistake is using oils with incorrect tolerances for specific models. For example, pouring oil with a high sulfur and phosphorus content into engines with particulate filters. This will cause permanent damage to the catalyst and oxygen sensors.
⚠️ Attention: Never use "5 minutes" flushing oils before changing. They are aggressive and can wash away the protective layer from the seals, causing a leak, or dissolve large deposits that will clog the oil passage.
Long-term storage of canisters in the cold or in direct sunlight is also unacceptable. Ultraviolet light and extreme temperatures destroy the additive structure before you even open the lid. Store oil in a cool, dry place.
FAQ: Frequently asked questions about Nissan 5W40 oil
Is it possible to put 5W40 into a new Nissan engine?
Yes, you can, but for new engines they often recommend 0W20 or 5W30 for better fuel economy. However, 5W40 can be used if climatic conditions require thicker oil.
How often do you need to change 5W40 oil in city conditions?
In conditions of dense city traffic with frequent traffic jams, it is recommended to reduce the replacement interval to 7-8 thousand kilometers to avoid degradation of additives.
Is 5W40 suitable for Nissan diesel engines with a particulate filter?
Only if the canister shows ACEA C3 approval. Conventional 5W40 oils with A3/B4 approvals can quickly damage the particulate filter.
What to do if the oil quickly darkens after changing?
This is normal for modern oils with detergent additives. If the oil turns black immediately, but does not lose viscosity and does not have a burning smell, this is a sign that it is working and cleaning the engine.
Is it possible to mix original Nissan oil with an analogue 5W40?
Strongly not recommended. Mixing different bases and additive packages can lead to sedimentation and loss of protective properties. It is better to drain the old and fill in the new completely.