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Originally posted by Nucleardawg:
Group II bulk oil used by many dealers and lube chains...Those are oils I just don't use in my vehicles...Though admittedly many do...vehicle owners enticed in by the $10-15 oil change, who after having it changed forget about ever checking it for a year.

The biggest cause of premature engine wear is owner neglect. For the most part even the cheaper oils will work with reasonable OCI. The owner needs to keep up on all facets of maintenance. A cheap little PCV causes how many problems? Leaking gaskets ignored, and the owner opting to just periodically fill the radiator.

Oil changes are just one facet of vehicle care...Important yes, but to often other facets are ignored, and we end up with the result of sludge, with the uninformed naturally blaming the oil.

Like these? A Kirk produced link:

Industry experts say modern engines are even more prone to sludge build up than older ones. So what’s the cause, and why is it making a comeback?

There are several key reasons.

Crankcase Ventilation.
Oil vapour and combustion gasses must be removed, usually by being channelled through the combustion process.
If these gasses are not disposed of efficiently, sludge will form. Some modern breather systems are more successful than others.

Changes to the positioning of the Catalytic Converter have led to changes in temperature, hot and cold spots, in and around the engine. Hot spots bake oil, cold spots cause acid and sludge.

Crankcase Acidity.
Modern fuels produce much more acid when burnt. A proportion of this acidity enters the crankcase. Experts say that long term engine wear is now as likely to be down to acidity as friction.

Tighter Tolerances.
Engines are no longer manufactured down to Thousandths but Microns. Tighter tolerances mean engines are
using less oil, and as a result customers fail to check levels and miss oil changes

Poor Maintenance.
Drivers who miss recommended oil changes are without doubt contributing to the problem. Lease vehicle drivers especially are quoted as being among the worst for neglecting DIY level checks.

City Driving.
Constant stop/start city driving accelerates sludge formation. Drivers who spend most of their time in urban traffic should be advised to book oil change services more regularly.

Don't see any blame on oil there either.