Touareg V8 - Engine Code: AXQ - Hydros make some noise occasionally

Hello everyone,

It's been a long time since I've been here.
However, so far only with diesel vehicles.
Now I have been driving a Touareg V8 USA model with LPG (manufactured in 2005 - 151,000 km) for almost 3 years.

The Touareg is simply fantastic and is really easy to drive.

For some time now, I've noticed that occasionally, when he's been parked in the garage overnight, all the Hydro's seem to be dry.
It really seems rough.

This might be due to starting the engine 10 times, or 1-2 times.

The rattling is definitely coming from the valve covers, but it stops within 1-2 seconds.

I change the oil every 15,000 km, and the next change is due in 2,000 km.

I use the Castrol LPG oil 0W60. Normally, I use 5W30 LL3 oil, but I no longer wanted to use it because of the gas system, and I also didn't want to do a long-life service anymore.

My good friend also has the same problem with his Audi RS4 V8 high-revving engine. Sometimes, when starting up, all the hydros (hydraulic pumps) make a rattling noise.

I suspect there might be some backflow preventers or similar devices.

What do you think about it?

Greetings and thank you

Marcus

Are you sure it's the hydros and not the chain(s) because the spanners aren't maintaining the oil pressure?

Quote:

Castrol LPG Oil 0W60

How is the VW approval status? You won't find 0W-60 directly at Castrol.
hg
Herbert

Please pour the correct engine oil back in.

Hello everyone,

Which chain spanner?

The engine still has a timing belt for the camshaft drive.

@ dieselschrauber:

Can you tell me which oil I should use for 'non-longlife'
can/should use?

According to Castrol, 0W60 is simply better, especially for LPG engines, otherwise it is 'supposedly' identical to the original oil.

The problem with the whole thing is that even the VW dealer doesn't know exactly - it's not clear from his records - which oil actually needs to be used in this 'USA' engine.

'However, the oil consumption was relatively high with the standard 5W30 oil.'
Up to 0.5l per 1000km, depending on driving style.

What do you think?

What oil should I use - as I said, without LL.

And which oil should my friend take?

Greetings and thank you

Marcus

snowman24 wrote:

Which chain tensioner should I use?

Sorry, my mind was on FSI/TDI.
Just ignore my post.

Okay, no problem.
Thank you anyway

Hello,

Quote:

According to Castrol, 0W60 is simply better

Naturally, according to the manufacturers, each product is better than the others, right?

In the manual, check which oil is the right one and buy it, done.
Longlife Oil can, of course, also be changed earlier than the Longlife indicator suggests.

Personally, I drive a Fuchs Titan GT1, and I recommend that everyone gets the one that they like and can afford at a fair price. There are also philosophical discussions.

If the hydros are clattering at startup, first try an oil change and other oils before doing anything else.

Best regards, Rainer

Quote:

According to Castrol, 0W60 is simply better, especially for LPG engines, otherwise it is "supposedly" identical to the original oil.

The 0W oil is significantly thinner than, for example, a 5W oil when cold. "This is conceivable, or rather, this is how it will be: the hydros will drain partially overnight."

Before you start looking for defects where there might not be any ----> Use oil with the appropriate specification.

If the hydros are worn (this is already possible at 151,000 km), using a different oil will only provide a temporary solution.

Quote:

If the hydropneumatic suspension components are worn (this is already possible at 151,000 km), using a different oil will not help.

To assess this, you first need the specified operating fluids and not just "water"

Quote:

According to Castrol, 0W60 is simply better, especially for LPG engines, otherwise it is "supposedly" identical to the original oil.

Where is it, please?
On the web, there are only references to racing applications for 0W60, and questions about the exoticly spread temperature range ("water" = +). Nothing from Castrol or other major manufacturers.
Castrol: Please refer to the approved oil list for the AXQ.
You just have to choose between "simply better" with some clacking (and possible long-term damage due to inadequate lubrication) and the manufacturer's approval.
That seems to be the general consensus regarding your question.
hg
Herbert

Hello,

Thank you for your responses.

Therefore, during the upcoming oil change, I will be refilling with the approved LL3 oil, but I will change it every 15,000 km.

If damage has already occurred or is occurring, regarding the hydraulic piston,
shouldn't it always be the case, or am I misinterpreting?

As already described at the beginning, the rattling noise only occurs occasionally when the engine is still cold and started for the first time that day.
Even if the car is parked for 3 days, it sometimes doesn't rattle.

I heard about a 'workshop' run by a master, and he mentioned that there are some check valves in the cylinder head of the V8 engine that prevent the complete return of the oil when the engine is turned off.

Do you have any ideas?

How can I access the cylinder head plans to see where the valves are located?

Greetings
Marcus

Quote:

There are currently some check valves in the cylinder head of the V8 engine that prevent the complete return of the oil when the engine is stopped. Do you have any suggestions?

Yes. The valves are not 100% airtight due to their construction. - Or O-Rings or similar as a wear protection are not known to me for VW/Audi.
The thinner the cold oil, the more of its capacity for filling can be lost over time.

/viewtopic.php?t=27045

Okay, first change the oil, then you can proceed. That doesn't make any sense at all!

Hello everyone,

Next week, I finally got an appointment at the workshop,
to get a few things done on my Touareg:

- Oil change - then the LL3 5W30 will be refilled.
- Replace front brake rotors and pads (first set at 152,000 km)
- Replace the crankshaft seal on the timing belt side
- Replace the water hoses for the GAS system, as they likely have a too large inner diameter. All are slightly leaky.

Regarding the oil again.
I was wrong - I currently have, or have had, the 0W40 from Castrol in my car. Castrol offers this as a special LPG oil.

What do you think?

Greetings
Marcus

Zero = zero, regardless of whether it's 40 or 60.

Wait and see if anything changes with the 5/30.


Addendum: It will take a while before the oil has had time to circulate and settle, making it possible to make an assessment.