Hi Tiguan 155 4mo new user

[dresdenguy]

Hi all, new owner of tig 155 4mo dsg , bought used one my13 model.

[dresdenguy]

What to look for and check as a 150k km old tig. .. everything seem fine. Plan to tune ecu. What to recommend? Will it a big difference after ecu tune ?

[Creampuff]

good luck, not many tune the 155. I enjoy the power it has.

[tigger73]

Hi and welcome!

I would be checking the service history for a start and making sure it is up to date.

Also at that age a good carbon clean of the valves may be in order.

Stage 1 tune is a noticeable improvement - bigger change in a 125/132TSI as they start off from a lower base but end up at the same spot.

[dresdenguy]

I see. Thks

[dresdenguy]

Regular services beforehand, and some tensioner tighten... Decarbo you mean? Is that effective to bring back some loss power and what is the damage usually.

[tigger73]

Carbon build-up on the valves leads to reduced performance.

This is at around 200,000km:



After cleaning:



Not mine but you get the idea.

[dresdenguy]

That is horrible build up !! Usually the clean up process require top overhaul, or just gas or liquid injection into chamber while engine is still running ? How much will it cost ? Thks.

[tigger73]

No it's taking the intake off and removing the deposits either by scraping them off or using walnut blasting.

Not sure on the cost but I'd get your engine checked to see if it's necessary. If it's done a lot of highway km it may not be so bad, however a lot of short trips will make for bad build-up.

[dresdenguy]

Got it. Other than carbon, what else should be check? Piston ring, rod ? Heard after high mileage, lub oil level drop fast, something like 2 to 3k km per 0.5 - 1L top up ... Thks .

[tigger73]

Yes these engines can drink oil with age so I’d recommend checking oil levels regularly - every fuel fill initially until you work out whether you have an oil burner or not.

You likely won’t know what oil has been put in. So if you have consumption issues you can go to a slightly heavier (5W40) oil.

The other thing to look at is to find out if your timing chain tensioner has been replaced/ is the updated part.

Earlier engines had a bad design part which could fail leading to catastrophic failure (valves hitting pistons). I think with the age of your car it should have the newer part but worth checking for peace of mind.


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[dresdenguy]

Looks like I have to check all these... Price of used high mileage car . Regarding carbon clean up, the intake I guess is in front of engine bay, so which mean it is easier job to be done. Expect effective and lower cost hopefully. After these , will be itchy to get those tuning upgrade

[dresdenguy]

Original oil is 5w30? I have some stock of 5w40 synthetic, for my other suv. Then they can share ! How nice.

[tigger73]

Original oil is 5w30? I have some stock of 5w40 synthetic, for my other suv. Then they can share ! How nice.

Just check that it's a VW approved oil. Not that it's so much a problem as the car is well out of warranty but I'd still use the VW approved stuff. Generally as it's tested/intended for 15k service intervals and some other oils may not last that long.

[dresdenguy]

Shell helix ultra 5w40. Really so long interval of 15k km ? Hard to believe...