m1kelys0ns wrote:Good morning, a couple of questions for you if you don't mind answering them...
I completely understand what you are saying, but is any of the above relevevent in this country/climate?
Alot of engines are still the same as the engines from the mid nineties when these oils didn't exist.. why is it essential now that we need to use them?
The 'basestocks' you mentioned, are these the results of the burning process in which oil companys use to burn the oil at a certain temp, and what is left over is the 'basestocks' Is this correct?
Factory fill, is this to test the car for the 'official' government figures, hence why they use such a thin oil, to reduce drag/resistance and to ultimately reduce CO2 emissions?
Is it correct that a high spec fully synthetic oil is good for 90,000 miles before being dropped and changed?
Thanks in advance for your time,
Mike.
Yes flow is relevent in any climate it's what protects the engine from wear but is obviously more essential as the climate gets colder.
Grade.................At 0C.........At 10C...........At 100C
0W/20.............328.6cSt......180.8cSt..........9cSt
5W/40.............811.4cSt......421.4cSt..........14cSt
10W/50............1039cSt.......538.9cSt..........18cSt
15W/50.............1376cSt.......674.7cSt.........18cSt
20W/50.............2305cSt.......1015cSt..........18cSt
Why should you use good oils? To protect your car's engine better in the long term and they stay in grade better.
You are talking about hydrocracked basestocks, highly refined mineral oils (known as Group III below) not manmade in labs group IV and V.
Basestock categories and descriptions
All oils are comprised of basestocks and additives. Basestocks make up the majority of the finished product and represent between 75-95%.
Not all basestocks are derived from petroleum, in fact the better quality ones are synthetics made in laboratories by chemists specifically designed for the application for which they are intended.
Basestocks are classified in 5 Groups as follows:
Group I
These are derived from petroleum and are the least refined. These are used in a small amount of automotive oils where the applications are not demanding.
Group II
These are derived from petroleum and are mainly used in mineral automotive oils. Their performance is acceptable with regards to wear, thermal stability and oxidation stability but not so good at lower temperatures.
Group III
These are derived from petroleum but are the most refined of the mineral oil basestocks. They are not chemically engineered like synthetics but offer the highest level of performance of all the petroleum basestocks. They are also known as “hydrocracked” or “molecularly modified” basestocks.
They are usually labelled/marketed as synthetic or semi-synthetic oils and make up a very high percentage of the oils retailed today.
Group IV
These are polyalphaolefins known as PAO and are chemically manufactured rather than being dug out of the ground. These basestocks have excellent stability in both hot and cold temperatures and give superior protection due to their uniform molecules.
Group V
These special basestocks are also chemically engineered but are not PAO.
The main types used in automotive oils are diesters and polyolesters. Like the group IV basestocks they have uniform molecules and give superior performance and protection over petroleum basestocks. These special stocks are used in all aviation engines due to their stability and durability. Esters are also polar (electro statically attracted to metal surfaces) which has great benefits. They are usually blended with Group IV stocks rather than being used exclusively.
It is common practice for oil companies to blend different basestocks to achieve a certain specification, performance or cost. The blending of group IV and V produces lubricants with the best overall performance which cannot be matched by any of the petroleum basestock groups.
Factory fill grades in many cases are used to achieved claimed fuel consumption and emmissions figures yes but can also be used ongoing.
NO I do not know of any oil that will do 90000, as the addatives are sacrificial and get used up.
Cheers
Simon
