Checking Pentosin CHF 11 S hydraulic fluid in the power-steering system

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2005 Porsche 911, 2004 Porsche 911, 2003 Porsche 911, 2002 Porsche 911, and 2001 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.

The reservoir is located in the engine compartment. There are two marks on the dipstick located on the reservoir cap. One side bears the mark "Cold" for a cold engine (approximately 20 C) and the other "Hot" for a hot engine (approximately 80 C).

NOTE: When topping up or filling in Pentosin, make sure that Pentosin does not come into contact with the coolant hoses! In order to avoid overfilling and thus overflowing, observe the specifications in CHECKING PENTOSIN CHF 11 S HYDRAULIC FLUID IN THE POWER-STEERING SYSTEM . If coolant hoses come into contact with Pentosin, thoroughly clean them with water IMMEDIATELY! Replace visibly swollen coolant hoses!

Fig 1: Identifying "Hot" Mark On Power Steering Reservoir Dipstick

Courtesy of PORSCHE OF NORTH AMERICA, INC.

Check the fluid level (Pentosin CHF 11 S) with the engine stationary and cold (approx. 20 C).

Open engine compartment lid. Open reservoir cap.
Wipe dipstick. Close reservoir cap and open it again. The fluid level should lie in the hatched area beneath the "Cold" mark (mark = maximum level at 20 C). Top up with Pentosin if necessary. The upper "Hot" mark is intended for a fluid temperature of 80 C.
In no case add too much Pentosin! The respective marks are for the maximum fluid level at the "COLD" or "HOT" temperature.

NOTE: If assembly work was performed previously, check the fluid level with the engine idling and without operating the steering.

Multiple steering operations (maneouvering) with the engine switched off change the fluid level in the reservoir - the fluid level rises. In this case, the engine must be run for at least 5 seconds before the fluid level is checked.