Ok, so I can see that there must be a difference in quality between a £15 for 4.5ltr oil and a £25 for 4.5ltr oil.
If the spec of the two oils is the same (A3/BE CF/CL and so on), then, as I see it, both oils must be capable of doing the job in the engine.
So, what is this 'quality' element and how do I know quality when I see it? Why is a Shell oil better than a Tetrosyl oil?
If the specs are the same then I can only judge the quality, by going by the price. The higher the price, the better the quality (which will all break apart if I am being overcharged for my oil!).
Steve
PS In the past, when I have looked at oil as it was draining out I have seen the sludge, on quite a few occasions. I can't remember the brand though. With this Carlube stuff I have not noticed any sludge.
If the spec of the two oils is the same (A3/BE CF/CL and so on), then, as I see it, both oils must be capable of doing the job in the engine.
So, what is this 'quality' element and how do I know quality when I see it? Why is a Shell oil better than a Tetrosyl oil?
If the specs are the same then I can only judge the quality, by going by the price. The higher the price, the better the quality (which will all break apart if I am being overcharged for my oil!).
Steve
PS In the past, when I have looked at oil as it was draining out I have seen the sludge, on quite a few occasions. I can't remember the brand though. With this Carlube stuff I have not noticed any sludge.