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Isn't the point that Americans get a quick lube at a fraction of the cost of ours?
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Coincidentally, my "20 ways to waste money" post.
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Robin
Filtration does little to 'keep oil degradation to a minimum'. Filtration does a vital job in removing particulate matter which would cause mechanical damage. However, it does nothing for viscosity degradation due to shear, nothing to replace additives which are used up in use, nothing to reduce oxidation and breakdown of the oil molecules themselves and nothing to remove contamination products due to short runs to name but four.
It's these key efects which contribute to engine wear, and these are the reasons that more frequent oil changes are a benefit in promoting long engine life.
Regards
John S
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Does changing the oil so frequently really benefit the engine life significantly? And if so, is there any evidence is there for this? If short runs are the norm, a change every 6 months/6000 would be sensible. Otherwise use makers service schedule. The less time spent in the dealer the smaller the damage to car and wallet:)
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Nortones2
Depends how long you wish to keep the car. Most service schedules are geared to fleet use where the cars get long runs and are sold on after, say, 80k miles. They are probably OK 'till then, and this gives minimum cost of ownership.
However, there have been instances quoted here of the cam chain failing on 2.2 vectras (20k service intervals), at much lower mileages - believed due to lubrication problems. Micras are apparently also prone to similar problems. So, for private use, it seems sensible to adopt a much more conservative approach, such as the 6 months/6k you suggest, whatever the usage. Oil changes are cheap compared to engine rebuilds.
Regards
John S
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