The product is only worth how much the customer wants to pay for it.
I have a MOUS case, paid 45€ for it after I broke the screen for the second time and I‘m super happy with it. It looks nice and it has probably the best protection of the cases on the market.
Alright mate, it‘s not a 1974 Detroit Diesel because if it were, after 50 years it‘d still be running fine without a rebuild.
40km in Europe is a bit but 40km in Europe are mostly back roads where you drive at most 100km/h, 120km/h if you‘re a speed demon. Even then, you‘re in 6th gear at max of 1500rpm.
Not good for the engine, soot buildup, catalytic converters and O2 sensors.
I live in Germany and know very well what kind of roads these are and how fast you can drive on them.
Most of the time you can‘t even drive 100km/h.
I don‘t know where OP is from but I‘m pretty sure he knows what I‘m talking about.
You probably kill it if you ride short trips. 30-40km is very little for a diesel.
At least weekly, push it on the highway to the redline to remove the carbot and sot buildup. Might be what‘s killing the probes.
Check again. You‘re holding the stick upside down so the oil drips back above the line.
If it wad above the left dot, it‘s too much. Too much oil can cause sloshing which introduces air bubbles which can starve your engine out of oil as the pump can‘t pick up the oil.
If it was above the second line by like 1mm, it‘s fine, if it‘s more than 5mm and a shop did the oil change, take it back and make them take out the surplus and put back in the correct ammout.