engine oil
- Thread starter walwo57
- Start date
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ye they recommend it for my 200tdi defender in the handbook bit runney for my liking
as for the disco 300tdi it states in my hand book for that 15w/40
so i use it in both
discomania
Well-Known Member
- Posts
- 6,947
Ah the age old question of "what oil should I use" in truth there is not really a correct answer.
Do you understand how engine oil works? Do you know what the two numbers refer to?
Oil spec is relative to WHERE and HOW it is being used.
The important bit is the 40 in this engine, the number before refers to the start up viscosity, the engine is behaving differently when it is cold, so the oil is less viscous which means it can blast about the engine and provide early on lubrication and is makes for easier starting; once it has warmed up it will act like a SAE40. If you lived in a hot climate then you would be able to use something such as a 20w40.
At the moment a 10w40 would be fine, come summer I would be more inclined to use a the 15, BUT it then depends on what sort of driving you do.
Here in the UK, particularly at the moment with the cold weather we have been having a lower cold viscosity would be ideal. If you look at the recommended oils you will actually see they spec almost ever grade depending on your climate.
Do you understand how engine oil works? Do you know what the two numbers refer to?
Oil spec is relative to WHERE and HOW it is being used.
The important bit is the 40 in this engine, the number before refers to the start up viscosity, the engine is behaving differently when it is cold, so the oil is less viscous which means it can blast about the engine and provide early on lubrication and is makes for easier starting; once it has warmed up it will act like a SAE40. If you lived in a hot climate then you would be able to use something such as a 20w40.
At the moment a 10w40 would be fine, come summer I would be more inclined to use a the 15, BUT it then depends on what sort of driving you do.
Here in the UK, particularly at the moment with the cold weather we have been having a lower cold viscosity would be ideal. If you look at the recommended oils you will actually see they spec almost ever grade depending on your climate.
pussyeater
New Member
- Posts
- 319
Discomania says it like it is
the only thing i would add is that a 10w or 15w oil when it's cold is a lot thicker than a 40 when it's hot
the reason you have multigrade oils is that oil thickens a lot when it gets cold so the perfect viscosity is a hot SAE40 but this oil would thicken far too much when it got cold to give the right protection when you started it up
the idea is to made an oil that thickens less when it gets cold, the thinner the oil is when it's cold, the faster it can be pumped around the engine.
10w-40 or 15w40 either are listed for UK climate but i go for the 10w-40 in mine just to give it better cold start protection
regards
Pete
the only thing i would add is that a 10w or 15w oil when it's cold is a lot thicker than a 40 when it's hot
the reason you have multigrade oils is that oil thickens a lot when it gets cold so the perfect viscosity is a hot SAE40 but this oil would thicken far too much when it got cold to give the right protection when you started it up
the idea is to made an oil that thickens less when it gets cold, the thinner the oil is when it's cold, the faster it can be pumped around the engine.
10w-40 or 15w40 either are listed for UK climate but i go for the 10w-40 in mine just to give it better cold start protection
regards
Pete
