Anyone tried Castrol Titanium oils?

[ainarssems]

It does not really matter what the viscosity is at low temp as long as pump can suck up oil quickly and provide sufficient pressure in short time, when it becomes like honey is when you should get worried. But even if it could not provide the pressure modern oils contain fair amount of high pressure and anti seize additives that it could probably run for couple several minutes without oil pressure at all lubricating from the remains of oil from previous use. Any damage would appear at hotspots due to lack of cooling that oil flow provides before flow or viscosity play any part.

In general higher viscosity is better in terms of protection unless it's too viscous to for pump to suck it up quickly. But it does have a drawback that more viscous oil need produces more resistance and takes more power and uses more fuel.

As you do not track your car I believe Quantum Longlife III will provide very good protection and value for money, just don't leave it to longlife service intervals but replace it every 8-10k miles or at least once a year which ever comes first.