stephane
Member
5w50 is a multi grade meaning they add more aditive so it will keep is grade in all temp the oil is not recomand because you simply dont need it!!! It is simply better and more complete oil. Those oil have all the grade and could be even use in any turbo diesel engine dont need to be a rocket scientist to understand if you could use it for many miles in any racing car,winebago, commercial truck diesel included for many miles then It will do the job in boat where you change the oil every 50-100 hour!!! Using lighter synthetic oils in lieu of heavier petroleum based oils offers "more" engine protection while also offering better wear protection too. It's a win-win situation.
Here some reading
https://www.fammllc.com/famm/publications/lubes_bulletins_06.pdf
This example shows that the high VI offers a relatively
small change in viscosity with temperature, and, as a
result of the high VI, the multigrade oil meets the 15W
grade low temperature viscosity requirements, as well as
the 40 grade high temperature viscosity requirements.
For marine applications, monograde oils, i.e., oils without
the addition of VI improvers of SAE 30 or SAE 40, are
used because of the steady operating conditions in a
ship’s engine room.
Conversely, automotive oils are normally formulated by
adding VI improvers to provide multigrade performance
and thus deliver excellent temperature/viscosity
relations. VI improvers are very large molecules,
which are chemically made by linking together smaller
molecules into so-called polymers. The use of these
special polymers makes it possible to meet the low
temperature viscosity requirements of the W grades, as
well as the high temperature requirements of the non-W
grades.
Here some reading
https://www.fammllc.com/famm/publications/lubes_bulletins_06.pdf
This example shows that the high VI offers a relatively
small change in viscosity with temperature, and, as a
result of the high VI, the multigrade oil meets the 15W
grade low temperature viscosity requirements, as well as
the 40 grade high temperature viscosity requirements.
For marine applications, monograde oils, i.e., oils without
the addition of VI improvers of SAE 30 or SAE 40, are
used because of the steady operating conditions in a
ship’s engine room.
Conversely, automotive oils are normally formulated by
adding VI improvers to provide multigrade performance
and thus deliver excellent temperature/viscosity
relations. VI improvers are very large molecules,
which are chemically made by linking together smaller
molecules into so-called polymers. The use of these
special polymers makes it possible to meet the low
temperature viscosity requirements of the W grades, as
well as the high temperature requirements of the non-W
grades.
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