Oil radiator installation. Possible troubleshooting solutions?

[Alvaro.G]

Hello everyone! My name is Álvaro, I live in Spain, and as I mentioned in my introduction, I’ve been the owner of a Multivan T6 DSG 4Motion CXEC Generation Six for a year now. I imported it from Germany, and it currently has 140,000 kilometers. Apart from a minor blockage in the metal EGR pipe connection, which I resolved without any issues, I haven’t had any breakdowns. Also, the engine doesn’t consume any oil. I change the oil every 15,000 kilometers, and this year I’ve driven 40,000 kilometers with it.

However, I’ve noticed a concerning problem: at times, when maintaining a steady speed while climbing mountain passes (even those that aren’t very demanding), the oil temperature rises sharply, even exceeding 130 ºC. On relatively flat roads, the temperature stays between 100 ºC and 110 ºC.

After researching, I found discussions in German forums, like Red Head, about this issue. It seems to be a common problem attributed to oil degradation caused by high temperatures, which is also linked to the well-known failures in BiTDI engines.

My question is: has anyone here installed the Wagner oil cooler, like the one sold by JH-Parts exclusively for the T6? Does it really help control oil temperature? Or would it be possible to install a generic oil cooler?

I’m considering installing one, but I’m unsure if it’s really worth it. I’d greatly appreciate any advice or experiences you can share. Thanks in advance!

 

[CAB]

Hello.

I have no idea myself. But I would have thought that it would just be masking the problem.

 

[Alvaro.G]

Hola.

No tengo ni idea, pero pensé que eso solo estaría enmascarando el problema.

No lo tengo del todo claro. Es una pieza cara, ronda los 1.000€, pero una cosa está clara: dudo que sea bueno para el motor si la temperatura del aceite supera los 130º en determinados momentos.

 

[Bert69]

Hi @Alvaro.G - I also have the high oil temperature issue and found the German sites that mention poor thermal management with the BiTurbo engines that in turn leads to engine failure. I have a CXEB engine.
Hopefully someone else on the forum has experience they don't mind sharing.

 

[Alvaro.G]

Hi @Alvaro.G - I also have the high oil temperature issue and found the German sites that mention poor thermal management with the BiTurbo engines that in turn leads to engine failure. I have a CXEB engine.
Hopefully someone else on the forum has experience they don't mind sharing.

Hello, my engine is also CXBE. I’ve noticed that this issue is more controlled during winter, but my advice is not to keep the oil for more than 15,000 kilometers. I’m also using an additive (Moligen Motor Protect), and I believe this helps as well.

 

[Minaei]

Hello everyone! My name is Álvaro, I live in Spain, and as I mentioned in my introduction, I’ve been the owner of a Multivan T6 DSG 4Motion CXEC Generation Six for a year now. I imported it from Germany, and it currently has 140,000 kilometers. Apart from a minor blockage in the metal EGR pipe connection, which I resolved without any issues, I haven’t had any breakdowns. Also, the engine doesn’t consume any oil. I change the oil every 15,000 kilometers, and this year I’ve driven 40,000 kilometers with it.

However, I’ve noticed a concerning problem: at times, when maintaining a steady speed while climbing mountain passes (even those that aren’t very demanding), the oil temperature rises sharply, even exceeding 130 ºC. On relatively flat roads, the temperature stays between 100 ºC and 110 ºC.

After researching, I found discussions in German forums, like Red Head, about this issue. It seems to be a common problem attributed to oil degradation caused by high temperatures, which is also linked to the well-known failures in BiTDI engines.

My question is: has anyone here installed the Wagner oil cooler, like the one sold by JH-Parts exclusively for the T6? Does it really help control oil temperature? Or would it be possible to install a generic oil cooler?

I’m considering installing one, but I’m unsure if it’s really worth it. I’d greatly appreciate any advice or experiences you can share. Thanks in advance!

I just ordered this part and I am going to install it, My engine is DMZA, T6.1 204 Hp, 2021. I have the same problem, over 100km/h the oil temp rises up to 130.
Although all the official services confirm it's not a problem I think the oil itself at a higher temperature will lose its task but I am curious what is the oil pressure at this temp.
I will post later on about the result of installation