Deviation of actual values from planned values

100-300 ml less oil than specified is filled.

Which is not a problem at all since the specifications are only guidelines anyway and the oil pan and other parts in the oil circuit never completely drain during an oil change. Filling up to the minimum level is completely sufficient.

Which is no problem anyway, since the specifications are only guidelines and the oil pan and other parts in the oil circuit never completely drain 100% during an oil change. Filling up to the minimum is completely sufficient.

If 5 liters are filled but 5.5 liters are listed on the invoice, that is called fraud.

Technically, you may be right.

Of course, the invoice should state what was actually filled in. However, your statement can also be understood to mean that the manufacturer's specifications are not being followed.

Example: A room is supposed to be 350 cm wide according to the specifications, but is only 335 cm. Would that still be within the tolerance range where nothing can be done?

The deviation sounds very large. It can arise not only from errors or fraud, but also from the interpretation of the measurement. For example, if you have a rough measurement of 3.5 m and an installation layer on both walls, then 15 cm less can easily result. Ask once, you can still make a complaint.

@ Of course, I assumed we were talking about the structural dimensions. Additionally, installations should also be visible in the plans from the 1950s. Surely, you are right, it is guessing when you don't know the circumstances and the plans. Fraud would be my last suspicion; that is easier with measurable or countable things. More likely carelessness or a thinking error. I would ask the site management for information.

Hello,

150mm deviation is quite a significant figure. To me, such dimensional errors always sound a bit like different planning documents. Was something shifted in the architect's plan that the structural builder didn't notice and/or worked according to old plans?

It would be worth asking about!