Bit of info here....MOTUL 300V 15W/50
Formulated upon esters and extremely efficient antifriction stocks, the 300V's are 100% SYNTHETIC
PERFORMANCE
Formulated upon esters and extremely efficient antifriction stocks, the 300V's are 100% SYNTHETIC and include no, viscosity boosters (or only trace amounts of), to achieve an extraordinary high resistance to shear.
The common characteristics along the whole 300V line are :
Remarkable decrease of the engines internal frictions, which guarantees high performance and reliability, quite often with a noticeable decrease of running noises.
Top resistance to high temperature charring - an extreme resistance of the oil film - résistance très élevée du film dhuile
Low volatility, with quite little evaporation at high temperatures.
Increased oil pressures and stability.
SPECIFIC TESTS
- Oil film resistance
Conventional multiple grade mineral and semi-synthetic motor oils, as 100% synthetic super-multigrade lubricants (5W40, 5W50, 10W60...) use additives to boost their viscosity. These viscosity additives tend to loose efficiency when submitted to extreme conditions, which translates into a drop of viscosity and oil pressure.
Since the 300V's of the MOTUL MOTORSPORT line benefit from the natural viscosity of synthetic ester basestocks, they need very little of such additives, or none.
The ASTM D 4741 official test of HT/HS* (High Temperature High Shear) viscosity measures the viscosity of lubricants at very high temperature (150°C / 302°F) and shear (1 000 000 s-1). This test is considered to be a good model of the fluid's state when exposed to extreme shear and temperature as found in an engine.
The higher the benchmark, the best the oil film keeps up its viscosity, hence its resistance to high stress in hydrodynamic rating. Tests prove the best results are achieved with a high viscosity grade (50 or 60) at high temperature, and without viscosity boosters.
- Resistance to high temperature coking
While racing, when the engine is pushed to the extreme, or during pit stops and refuellings, (Track day activities accurately mimic these scenarios), the oil temperature reaches maximal values.
The same happens to your car when stuck in traffic jams, hard or fast-driven for long journeys Etc .
Hence the capital attention to avoid the carbonization of lubricants heated to high temperatures.The lubricant residues carbonized through overheating (i.e. charring) are weighed, the best benchmark being a low weight.
The test measures the coking of engine oils at a sustained high temperature (5 days at 160°C / 320°F) and blasted for 48 hours against an aluminum shim heated at 290°C / 554°F.
Tests prove the choice of basestocks, especially synthetic ester bases, to be a major promoter of resistance to high temperature coking.
The 300V's of the MOTORSPORT line reveal virtually almost no coking during this test.
Esters
All jet engines are lubricated with synthetic esters, and have been for 50 years, but these expensive fluids only started to appear in petrol engine oils about 20 years ago. Thanks to their aviation origins, the types suitable for lubricants (esters also appear in perfumes; they are different!) work well from 50 degC to 200 degC, and they have a useful extra trick.
Due to their structure, ester molecules are polar; they stick to metal surfaces using electrostatic forces. This means that a protective layer is there at all times, even during that crucial start-up period. This helps to protect cams, gears, piston rings and valve train components, where lubrication is boundary rather than hydrodynamic, i.e. a very thin non-pressure fed film has to hold the surface apart. Even crank bearings benefit at starts, stops or when extreme shock loads upset the hydrodynamic film.
We recommend Silkolene PRO or Motul 300V as being the best choice if you want a "top" oil.
