After starting my TT for the first time after its been stood for 3-4 days there's a pronounced clatter until the oil gets circulated / pressure comes up then all is well.

Strange thing is it's just started doing this - in the past I could leave it for a couple of weeks no problem ie no start up clatter.

Is there some sort of pressure / valve which is losing pressure / leaking which might be causing this or is it entirely normal ?

Running Mobil 1 0-40W if that matters.

Thanks Tim

UPDATE

Following jpflips's advice - I switched to Castrol 5W40 Syntec (fully synthetic) and the brief start up clatter which tended to happen after being stood for 3-4 days seems to have gone away. I suspect because the oil was due for a change and this new oil seems to better meet the engine needs. Early days, but promising.

 

Could be normal. Depends upon how contaminated the oil is with water/unburned fuel. If heavily so, this thins the oil and there is less residual oil in various places and clatter upon startup is the result.

I know my Porsches' engines always make less start up noise with fresh oil vs. oil that is due (5K miles) to be changed.

Porsche techs tell me that Swepco 502 oil treatment a good additive for use in Porsche engines that sit long periods of time between uses. This additive tends to reduce startup clatter. I use it in both my cars even though I use them regularly. (I had some of the stuff analyzed: It contains 200ppm molybdenum disulfide.)

Or you might consider switching to a different Mobil 1 oil. It may be a Mobil 1 10w-40 oil might quiet down the engine.

Or a different oil entirely: I run Castrol Syntec 5w-50 oil in both my cars' engines.

Sincerely,

Macster.

 

Try adding a some of this http://www.tufoil.com/ I believe you add one ounce per quart in the engine (do not overfill), I had no noise issues but could tell a difference how much quieter the engine got when I added 6 oz.??

 

Hello tim! There is a TSB concerning this problem. I also got the same thing happening if I didn't use it for more than a day. If you read this TSB you will found a possible lack of oil on start up due to a bad check valve and all the oil end up in the crankcase, and the pump take his oil from the tank! The time the oil get back from the scavenge pump to the tank take about 5 to 10 seconds.... Anyway it is a good reading and not too difficult part to inspect or replace.... Of course you need empty the oil reservoir.... I hope this help anyway it is useful information...

 

Yow. Not to be alarmist for 2muchtime, but I'd recommend you get
an oil and filter change and never use that stuff again. Dupont is the
*only* industrial source of teflon, and did a lot of research about
it's own product for lubrication products, and neither they, nor the
oil vendors found any value to teflon in suspension. Oil 'additive'
(snake oil) companies sued DuPont to force DuPont to continue to sell
teflon in spite of their knowing it was of no benefit, on the grounds
that there is/was no evidence of any harm. It *can* block filters,
and *doesn't* help.

 

Mine will do that same thing. Using Mobil 1 5w-50w

 

Hi jpflip

I'll check to see if my oil warning light is on during the time it's clattering at start up - I suspect it isn't, but best check.

Also it only does this if it's left parked for 4 days or so - if I drive it every day it's not a problem.

None the less I don't like the sound or thought of lack of oil during start up when most engine wear occurs - so it's on my project list.

In the meantime I'll just drive it more....

As for Teflon / PTFE additives and the infamous 'Slick 50' marketed in the UK years ago - I agree 'snake oil'.

Sad thing is the snake oil sales men seem to be everywhere on the web parting 'fools and their money' :-)

 

Since I rarely drive mine on back to back days and it can sit for days at a time, I'm very familiar with the "clatter" noise you speak of. Although it has never concerned me much (since it lasts for less than 5 seconds, sometimes probably 2 seconds) I think this is a great thread and I'm glad to read about potential causes for it. I'm a 0w40 Mobil One user myself.

 

UPDATE

Following jpflips's advice from another thread - I switched to Castrol 5W40 Syntec (fully synthetic) and the brief start up clatter which tended to happen after being stood for 3-4 days seems to have gone away.

I suspect because the oil was due for a change and this new oil seems to better meet the engine needs. Early days, but promising.

PS my turbo is up for sale in the classifieds section - so wanted to get his resolved for the next lucky owner :-)

 

I am happy that you got rid of this clatter Tim. But I am really sad to see that you have to get rid of this beauty. I hope it is to get something better because how could you live without a nice toy???? Good luck for your sale and thanks for your help and effort, J.P.

 

I asked the same question on here about 4 months ago and provided an audio/video clip for people to listen to. My car does this at cold start up as well when it sits for several days/weeks. Nobody seemed to be worried about it on the forum. I also called and talked to several Porsche mechanics and all said it was normal and don't worry about it. I may try replacing the checkvalve though at next oil change and see if that helps.

https://www.6speedonline.com/forums/...old-start.html

 

I replace the valve without any success.... if your oil change is coming soon simply change your oil grade. Try Castrol Syntec 5W40 or the Mobil 5W40 TDT as per Kevin recommendation on Rennlist...

 

My car has Mobile 1 15W50 in it right now which I've read is not a Porsche approved viscosity but it is what my local Porsche mechanic uses and he says the lower viscosity oils are for cold climates which we don't have in the bay area. Not sure if I totally agree with that philosophy since there is probably more involved than that. While I've heard from several sources that the noise is normal, that sound to me implies extra engine wear and if it can be avoided, that would be good. I'll be doing my own oil change next time around so I may just try one of those oils that Kevin recommmends and see if that helps.

 

Thanks for the good info. My car has been doing much of the same "clicking" during start ups. I did switch to 5W-40 and it almost eliminated the problem except after very extended sitting periods of a week or more.

 

Good. I was going to suggest switch to 5w40. That's what I run. [Pentosin]