Engine oil RAVENOL or FUCHS

I have an Octavia 2.5 vRS TDI and it has 450k km now, it only drank 5w30 and never an issue, not even in cold winters and I had a few -25 starts and it started right away, at the first key turn.

Using it for 5 years, changing oil avery 8000-10000 kikomiters, enjine souns good (as for disel car)

Even Ravenol, which is pretty expensive since it is made in Germany from Group V base stock. Great stuff.

Fuchs Titan pro 5w50

I used to have castrol but since i chiptuned my octavia i switched to ravenol and the oil temps went down a good bit and it doesnt use any oil but that could also be because the old oil was 0w20 and the new one is 5w40

Last month I replaced the valve stem seals and it helped massively with the smoke. It doesn't really smoke much anymore, there's definitely still small puffs when taking off quickly, but nothing that I can see in the mirror.

I go with 10w40 Ravenol TSi

Last oil change I've decided to try what my friends run and bought FUCHS GERMANY: TITAN SYN MC 10W-40 and put 2k km on it, I'm pleased, it's nice greasy and cheap

I have oil analysis done in my TDI and a 10K OCI is a reach. The factory fill was almost depleted of wear additives at 5,500 miles. Fuchs Titan GT-1 was still serviceable at 7,000 miles, but I would not have carried it out beyond that.

after 2000km of running on it, i see there is quite a drop (30% from the max point). i think that is very weird...