Opel Z17DTJ Diesel: Valve Clearance Adjustment

Hello everyone,

This is my first post. If I violate any forum rules or netiquette, please let me know. I couldn't find anything relevant in the search or in the articles.

Subject:
I checked the valve clearances on my Astra H (manufactured in 2009, engine type: Z17DTJ 81kW) during the 150,000 km service. According to the documentation, the standard range is 0.4mm +/- 0.05mm. However, the first intake valve has a clearance of 0.3mm (a 0.35mm feeler gauge definitely doesn't fit), while all other valve clearances are within the standard range.

The game is stopped by the valve lifters. To replace them, the injectors and camshafts must be removed.
Two mechanic friends have recommended that I leave the valve clearance as the measured value (specifically for an intake valve), as they believe this value is acceptable. I am inclined to follow their recommendations because I am hesitant to proceed with the work.

What is your opinion on this? I understand that, according to the technical documentation, the game needs to be modified, but I'm interested in the personal opinions of the people present.

As you mentioned, from a technical perspective, something should happen, but I would also consider it sufficient to stop there, given the amount of work involved.
5/100 are definitely still acceptable.

That was fast. Thank you!