There is some credence to the use of LM Ceratec, however it won't restore compression or reverse bore scoring.
The cylinder blocks in the Cayenne V8 as well as Panamera and Macan models are cast from Alusil. The bores are basically raw aluminum and they undergo a process that exposes the silicon particles. There is no plating on the bores. What happens is that when too many of the silicon particles fracture, the oil tribofilm can no longer be supported and you get scoring. This also can occur if the iron clad piston skirt coating fails, resulting in aluminum to aluminum contact with metal transfer and galling.
Ceratec as well as LM's MoS2 additive contain moly. Moly can bind to the aluminum where ZDDP cannot. Porsche approved oils have little to no moly, even Liqui-moly's A40 approved oils, so you have to add an additive or use a non-approved oil that has high moly levels. Driven DT40 and Millers Nano 5w40 are two such oils with high moly levels that are beneficial to protecting against bore scoring.
You do bring up a good point as to older Porsche models and other makes that also have used Alusil blocks. Kolbenschmidt changed the manufacturing process in the late 90s to use a mechanical exposure process rather than a chemical one which can result in fractured silicon particles. Also the piston manufacturers went away from iron clad piston platings to coatings that are nowhere near as durable. There are other contributing factors as well. For those curious, I spent years researching this issue as it also pertains to Boxster, Cayman, and 911 models with Lokasil engine blocks:
Since 2002, LN has delivered precision performance parts and services for Porsche engines including Nickies cylinder and piston sets and ims bearing kits.
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