Long Life servicing isn't about serving the Owners interests or the Vehicles.
It is an eco thing to reduce the amounts of used engine oil produced nationally each year. (As is the reduced sump capacities of many modern engines! some have little more than 3 litres!

)
The combination of Turbos, (Ludicrously) high specific performance low capacity engines, hydraulic valve trains, reduced sump capacity and extended service intervals is a perfect
****storm of mechanical madness!
20-30,000 mile oil changes make about as much sense to me as not having a spare tyre!#
You will probabally get the 100,000 miles/8 years that the manufacturers want you to get using a LL strategy but I wouldnt want to bet too much on getting much more than that, especially on the sub 1600 TD's!
(# And that is an ecotard thing too really! I know all about directional tyres but that doesn't preclude having an omnidirectional spare. The "No Spare" thing is about weight/emissions saving! No spare also = No jack/tools which also saves weight! Good for box ticking but not at all good in terms of practical utility! (It also slightly reduces production costs resulting in a slightly lower sale price C/W the opportunity to sell a "Spare Kit" for an outrageous sum! I was in a Renault dealer the other day and they were offering a "Spare Kit" for a mid level model IIRC it was over £300!))