- If someone wants to believe in the magical properties of this or that oil producer, then we have freedom of religion. I personally didn’t bother and poured different oils into my opel, from scratch and for 160 thousand km, but mostly GM 5w30, sometimes filled / interfered with ZIC 0w30 / Shell / Castrol, changed once a year on a run of 15-18 tons km. , never warmed up (but did not pile on the cold). During this time, nothing happened to the engine, the engine was clean until the very sale, it didn’t smoke, it didn’t rattle, even the catalyst didn’t die, the buyers were looking for bullies and didn’t find anything.
- there are fakes - there are ((look so that the hologram reflects the Opel / GM badge vertically and horizontally. The vertical number on a white background on the sticker on the front must be through the site indicated on the white book on the back. Made in 2022 (Lukoil oil) has a cover without instructions, when the hologram is torn off, there are dots in a checkerboard pattern. Made in EU does not have them - it's just a sticker, but this does not seem to be a sign of a fake, and the lid should be with instructions. wow.