I was over on the golfgti forum and one poster has posted this:
Coming up to a 20,000 mile service, so decided to get a quote from a well known VAG specialist as well as local dealers.
Asked for Long Life oil, as per the perceived wisdom that many on this site advocate.
Said it had already been changed at 10,000 miles, so it wasn't the first service.
Was a bit surprised to see in the response that as a matter of course they will not put long life oil in the cars that they service, unless explicitly told to do so by the customer, because of many previous problems when using that oil.
So, I phoned up to discuss.
Reason given was that over many years of experience, they have encountered several failures of VAG engines, including the 1.8T and 2.0 FSI, due to the oil uptake pipe on the suction side of the pump clogging up, obviously a potential engine killer.
They said this usually manifests itself from 8 years - 80,000 miles upwards.
Their experience tells them that it is the long life oil that is the cause of the problem.
Obviously, not many 2.0 TFSI engines have done that mileage, so they haven't come across a problem with it yet, although they have had an A3 2.0 FSI engine with the problem.
So they highly recommend an engine flush to make sure that all gunge is removed then to use a 10W40 oil instead.
Also said that the 5W30 long life oil will take longer to warm up and this in itself doesn't do the engine much good.
I guess the other variable is that the spec of the long life oil (now at mark 3) has changed over the years.
Don't know if that makes any difference ?
They are an outfit that has received a lot of good press on this web site from many frequent and trusted inhabitants, and they are very familiar with highly tuning all variants of the 2.0 TFSI plant, as well as routine servicing.
They didn't want to be named because of potential problems with VAG themselves, so I won't do that.
Anyone else on here heard of similar problems later in a VAG engine's life that could have been put down to use of long life oil ?
http://www.golfgtiforum.co.uk/index.php?topic=98261.0