Endress Professional GT Serie Notice D'utilisation page 70

Commissioning
Fill the generator with engine oil
Fill the device with engine
24
CAUTION!
Using the wrong engine oil will destroy the engine.
Please check the average ambient temperature and fill
with the types of oil specified in the following:

.... < 0° => SAE 10 or 10W30; 10W40

0°-25° => SAE 20 or 10W30; 10W40

25°-35° => SAE 30 or 10W30; 10W40

35° > ... =>SAE 40 or 10W30; 10W40

Never mix a commercial additive with the oil.
Fill the generator with engine oil as follows:
oil
1. Remove the oil dipstick.
2. Introduce the filling aid into the filling opening.
(for example a filling funnel not in the scope of delivery)
Pour in the engine oil up to the edge of the oil filler neck.
3.
(see page 38 "Technical Data") for the quantity of oil to use).
4. Remove the filling aid.
5. Screw in the oil dipstick.
6. Repeat the filling process if the oil level is too low.
7. Screw in the oil dipstick again
 The device is now filled with engine oil.