i also think the problem with sludging on the old 1.8 20v t was also down to the small sump, for some reason this helped to create the 'sludging'
They did similar with the PD engines, and are repeating this with the GTI engine, with the FSI high pressure pump cam lobe wear.
Hi T_T,
This is really interesting. I thought the weak point with the cam lobe wear was the HPFP Cam Follower which is wearing prematurely and causing the HPFP to come into direct contact with the cam lobe hence causing the wear.
How would the use of LL3 oil prevent this?
Right - there are much higher 'forces' associated with the FSI HPFP - it has a relatively 'strong' return spring in the pump, when compared to relatively 'weak' return springs for the normal inlet and exhaust valves. The FSI HPFP is basically putting similar loads onto the camshaft which the unit injectors of the PD diesels do (take a close look at a PD injector, and they have strong springs too). So, understanding that they (PD injectors and FSI HPFP) have
much beefier springs, and also understaning how a camshaft applies its loads - this places a unique requirement on the lubricant. The camshaft is the only component in the engine which places large 'sheer' demands on the lubricant film - this is true in 'normal' engines (ie, non-PD and non-FSI - which just operate inlet and exhaust valves - ok, the elderly pedants out there will also state the very old skool manual fuel lift pumps, but these had a very weak return spring, and were normally used on engines where the camshaft was mounted in the block, and not head-mounted overhead cams

) - but this 'sheer' demand is massively higher on PD engines (and the derv-heads will know about the specific PD-only oils), and this is also true of FSI engines too.
OK, with the above thoroughly digested and understood - we now move onto the specifics of lubricants. If you look at the first post in this thread:
http://www.golfgtiforum.co.uk/index.php?topic=65779 - and scroll down to the bit under the "Engine Oils" heading, you will see I describe briefly the different Volkswagen testing 'standards' for the oils. For a genuine LongLife 3 oil, it must comply with two VW standards - 504.00 (this is a petrol engine standard) and 507.00 (and this is for diesels) (there may also be other non-VW standards too, such as the ACEA A3 and B4, but these are not relevent to this particular point of discussion). Now, open your glovebox and open the second from last booklet (providing all the books are there) - should be titled something like "GTI Technical Data", and search for the oil requirments. You will see that it gives three VW standards of oils - for the LongLife service regime: 503.00 and 504.00, and for Time and Distance regime: 502.00 (and also includes the LongLife oils too). So, to take the LL3 oil, you will see that the GTI requirement matches the 504.00. Because ALL Volkswagen oil standards are 'backwards compatible', the current 504.00 petrol engine standard will also comply with 503.01, 503.00, 502.00, 501.01 etc, and the same for the diesel standards. So if we now specifically look at the "502.00" oils so vhermently 'recommended' by the Yanks, and also understanding that VW-specced oils are generally are 'dual fuel' (one oil is formulated for use in petrol
and diesels - just like the LL3 oil) - then you will find that virtually all 502.00 oils will only have the diesel spec of 505.00. This is a crucial observation for FSI engines, becuase the derv-heads will know that 505.00 is NOT rated for the PD diesel - so, in basic terms, 502.00 oils have NOT been tested (nor designed for) any 'high sheer loads'. OK, there are a small minority of 502.00 oils which do meet the higher diesel spec of 505.01 - but these are always sold as "PD diesel engine oils", or "Turbo Diesel engine oil" or similar, and are generally much more expensive than a non 505.01 oil.
So, in summary - a "Time and Distance" oil does NOT have any 'high sheer' abilites needed for the FSI HPFP, whereas the LongLife oils (LongLife 2 and LongLife 3) do.
My 2.5 year old 2.0 TFSI (company car) is approaching 60k miles now and has been serviced on the LL regime. The services have occurred every 16-17k. My mileage consists of 95% motorway miles and the occasional spirited drive at the weekend. I am thinking of buying the car at the end of the lease so with this in mind do you think my service intervals have been appropriate for the type of use the car has had.
Well, provided the car has always been serviced when the SID pings you, and not been fiddled with and reset like some other forums seem to adamantly recommend, then it
should be OK. Can I ask why your GTI was set to LongLife servicing? Was it some requirement of the lease company?