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Steve Tinker · 10-17-2016, 02:41 PM

The usual culprit of oil on the outside of the intake tube is from the hydraulic steering fluid overflow pipe - that's the reservoir located just behind the intake @ 11 o'clock in your photo.
Check the level and only use Pentosin CHF11S or CHF202 hydraulic oil to top up.

Oil in the inside of the intake tube can mean a failing AOS - check for oil again in say a thousand miles. Can you remove the oil fill cap OK with the engine hot & idling - a failing AOS causes a vacuum making the cap (sometimes) difficult to remove.....

10-17-2016, 02:41 PM	#2
Steve Tinker Registered User Join Date: Dec 2008 Location: Queensland, Australia Posts: 1,522	The usual culprit of oil on the outside of the intake tube is from the hydraulic steering fluid overflow pipe - that's the reservoir located just behind the intake @ 11 o'clock in your photo. Check the level and only use Pentosin CHF11S or CHF202 hydraulic oil to top up. Oil in the inside of the intake tube can mean a failing AOS - check for oil again in say a thousand miles. Can you remove the oil fill cap OK with the engine hot & idling - a failing AOS causes a vacuum making the cap (sometimes) difficult to remove..... __________________ 2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley. 2001 MV Agusta F4.