Approaching 100k and only done 2 oil changes 😬 2015 passat tdi

[lipsmccoy]

Keep an eye on your turbo. I can tell you from experience it’s the week link and if it fails your going to have oil in everything you don’t want oil. Keep on top of air filters too.

From what I've heard these turbos pretty much suck no matter how much you change the oil lol

 

[lipsmccoy]

One of the Physics Professors at a Canadian University had a theory that the reason cars rusted was because they were washed. So he bought a new Volvo and never washed it.

And of course it rusted like crazy. So he told everyone what he had done and that his experiment had determined that washing your car did not cause it to rust. Quite the opposite in fact.

I hope the thread starter is prepared to reveal all when the "chickens come home to roost", so to speak.

We'll find out i guess!

 

[lipsmccoy]

Oil is cheap, not changing it is stupid. Next topic.

It might be stupid but it sure is fun haha

 

[lipsmccoy]

@lipsmccoy everyone in here calling you a troll and making fun are doing what they accuse you of. Trolling.

I'm on your side. I will say that you need to watch the soot. IMO 1% is too high and is what I would consider the limit.

With bypass filtration I think you could go longer.

Thank you! Yeah I kinda wondered about soot levels myself, that is why I kinda chickened out. All other points on the uoa looked good for my miles so why not? People on this site take oil change a little to seriously I think.

 

[RooflessVW]

Prior to the SW update your EGR was probably not functioning. This would explain a lot.

The EGR always worked. As I understand it, the SCR was most affected system, along with less frequent DPF regens.

 

[lipsmccoy]

Why?

Why not?

 

[kschachn]

It might be stupid but it sure is fun haha

You’re doing a good job of keeping the thread alive, I’ll give you that. Mostly by ignoring anything factual but you do what you have to do I guess.

 

[RooflessVW]

You’re doing a good job of keeping the thread alive, I’ll give you that. Mostly by ignoring anything factual but you do what you have to do I guess.

What did you just do? What facts have your brought?

What does all the continued poo-pooing serve?

 

[BMWTurboDzl]

The EGR always worked. As I understand it, the SCR was most affected system, along with less frequent DPF regens.

It was the EGR because initially VW didn't want to spend the $$$ fitting the SCR(UREA) system to it's cheaper 4 cylinder models however it did impact the more expensive 6-cylinder diesel models which were equipped with SCR.

Basically the EGR was only active when on a test bed (constant speed, no steering input). This was why competitors couldn't figure out how these models had so much better mpg's in real world driving because as you know EGR reduces MPG.

Now soot loading impacts DPF life obviously but I'm not sure if there's more or less soot without EGR. The OP would experience significantly less soot loading of the oil with EGR not active and consequently his UOA's look better than they otherwise would be.

 

[MolaKule]

Just like the title says only 2 oil changes done in the last 100k miles.... thoughts?

Why is it fun to abuse an engine? Did you buy this vehicle cheap just to run an experiment and to get some air time?

BTW, UOA's are mainly used to determine oil condition, not engine condition.

 

[RooflessVW]

It was the EGR because initially VW didn't want to spend the $$$ fitting the SCR(UREA) system to it's cheaper 4 cylinder models however it did impact the more expensive 6-cylinder diesel models which were equipped with SCR.

Basically the EGR was only active when on a test bed (constant speed, no steering input). This was why competitors couldn't figure out how these models had so much better mpg's in real world driving because as you know EGR reduces MPG.

Now soot loading impacts DPF life obviously but I'm not sure if there's more or less soot without EGR. The OP would experience significantly less soot loading of the oil with EGR not active and consequently his UOA's look better than they otherwise would be.

Correct, but all US Passats had EGR/DPF/SCR; the 2015 models needed only software.

NOx was the big issue with the SCR/DEF cars. EGR is more active during cold start for a faster warm up.

 

[RooflessVW]

Why is it fun to abuse an engine? Did you buy this vehicle cheap just to run an experiment and to get some air time?

Is it being abused? The UOAs show nothing alarming.

 

[MolaKule]

Is it being abused? The UOAs show nothing alarming.

I also stated, "BTW, UOA's are mainly used to determine oil condition, not engine condition."

 

[lipsmccoy]

It was the EGR because initially VW didn't want to spend the $$$ fitting the SCR(UREA) system to it's cheaper 4 cylinder models however it did impact the more expensive 6-cylinder diesel models which were equipped with SCR.

Basically the EGR was only active when on a test bed (constant speed, no steering input). This was why competitors couldn't figure out how these models had so much better mpg's in real world driving because as you know EGR reduces MPG.

Now soot loading impacts DPF life obviously but I'm not sure if there's more or less soot without EGR. The OP would experience significantly less soot loading of the oil with EGR not active and consequently his UOA's look better than they otherwise would be.

Very interesting point...

 

[RooflessVW]

I also stated, "BTW, UOA's are mainly used to determine oil condition, not engine condition."

That's kinda my point. If the oil is in serviceable condition, why wouldn't the engine be?

 

[kschachn]

That's kinda my point. If the oil is in serviceable condition, why wouldn't the engine be?

But that's kinda my point. A $30 spectrographic analysis (with or without TBN/TAN) will not gauge whether an oil is entirely serviceable. The engine could be sludged up or worse and there's nothing on that UOA that will tell you so. Many tests comprise a VW approval for suitability and performance, nearly all of which are not included in a Blackstone analysis.

People ascribe all sorts of miraculous abilities to UOA but that doesn't mean it is capable of them all.

 

[M56959]

Going in circles