Quick follow up query:
Is changing the oil and filter half way between the regular services a worthwhile cost? I can get a mate to do it for cost of parts and a pub lunch!
Thanks
Can of worms status: open :)
Some will say yes, others will say no. The truth is, the only way to REALLY tell if it's worth it is to send off samples of your car's engine oil for analysis, to see how much it has degraded in use in terms of dilution / viscosity loss / wear metals etc.
But even if this shows that it IS worth changing the oil more frequently, it's no guarantee that the engine will last longer, as all sorts of things can fail which aren't dependent on oil.
Also, each test will cost you more than 5 litres of oil and a lunch for your mate ... so it's up to you.
My 10p worth is this: get your mate to change the oil every 6 months, but not the filter - change the filter at the annual service. Oil filters become more efficient at filtering after a period of use (within reason, obviously) because the material trapped inside reduces the pore size in the filter material.
In the motorcycling world, it's common practice across the major manufacturers to change the oil every 4,000 miles, and the filter every second or third oil change. Of course, the more frequent oil changes are needed because a) bike engines tend to rev higher and work harder than car engines, so the oil is subject to more punishment and b) bikes share the oil between engine and gearbox, and the long-chain hydrocarbons that maintain the oil's viscosity get literally chopped up when lubricating the gear teeth.
But it underlines the point that in the manufacturers' view, the filter's capability usually outlasts that of the oil.
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