110PS - which oil?

[Sasquatch]

Hi
I’m a retired diesel mechanic so nowhere near your understanding of oil, but what I worry about is the vw recommendation of 0w-30 more to do with meeting emissions and fuel consumption rather than engine life.
I really dislike how water like the used oil is.
Thoughts?

It is indeed very thin, but...

I agree that it is all about emissions and fuel consumption, but theoretically with the 0w30 rating it should be the same viscosity as 5w30 when hot, just thinner when cold.

Modern materials are so good and production tolerances so precise that they can get away with a thinner lube, mainly for emissions purposes. That said, any improvement outside of a lab environment is probably undetectable,

The other benefit are reduced frictional losses when cold, lower mechanical losses through pumping a lighter fluid, etc. All marginal gains, but there hasn't been a significant breakthrough in our understanding of the four stroke cycle since the 1980s so these marginal gains have become very important.

So it's done mainly as a tick-box exercise for legislative purposes, because outside of a lab then difference in the real environment are pretty much nil.

I'd be quite happy to run 5w/30 in the UK climate, provided it meets the relevant VW approval standard.

 

[Martin Crikey]

Hi,
I'm thinking of using Millers trident professional 5/30 semi synthetic oil for the next oil change, I feel being part mineral gives the oil more body. The ideal of oil being thinned with diesel seems crazy engineering for the long life of the engine so I will be changing every 5k as it doesn't do that many miles and oil is cheaper than metal. If Millers is a bad choice i would be grateful to know.

 

[Sasquatch]

The ideal of oil being thinned with diesel seems crasy.

It is crazy - it is practically unheard of on the T6.

I feel being part mineral gives the oil more body.

A semi-synthetic 5w/30 has the same viscosity characteristics, or "body", as a fully synthetic 5/30.

The differences are down to the base stocks used to produce the product, and the resulting consistency of the product down to the molecular level.

 

[HossP]

Thanks for the replies.

What is concerning is that when I picked it up after its annual service at 27k kms it was noticeably quieter.
Which indicates the oil is either diluting or breaking down.

 

[Sasquatch]

Or it perhaps had the wrong oil in it previously...

 

[Bigsidavies]

I always think mine sounds quieter after an oil change, and mine is always done at less than 7k intervals.

 

[JumpShip]

Yeah ours is always quieter too ....probably the same way it drives nicer when I've cleaned it

 

[bluezie]

VW 507.00 there you go, the correct oil! There is a lot more to oil than the viscosity, that is just one specification amongst loads. VW 507.00 ensures all the variable specifications are correct for the engine.
I don't see any point in messing around with non spec oils, at best it will do nothing, at worst wear out the engine and knacker the DPF.

 

[Sasquatch]

VW 507.00 there you go, the correct oil! There is a lot more to oil than the viscosity, that is just one specification amongst loads. VW 507.00 ensures all the variable specifications are correct for the engine...

...and that VW Group AG receive their fee under the licencing agreement.

 

[DaveD]

I always think mine sounds quieter after an oil change, and mine is always done at less than 7k intervals.

That's a van I'd buy second hand.
(If you were selling and I was buying!)

 

[DaveD]

It is crazy - it is practically unheard of on the T6.


A semi-synthetic 5w/30 has the same viscosity characteristics, or "body", as a fully synthetic 5/30.

The differences are down to the base stocks used to produce the product, and the resulting consistency of the product down to the molecular level.

Oil dilution is far from unheard of in the T6;

Search results for query: dilution

www.t6forum.com

 

[Sasquatch]

Don't do that on a new engine though it'll never run in properly. Glazed bores and a smoky exhaust are a potential side effect.

If your mileage allows it try and get to around 30k miles before dropping the oil change interval. That harder for folk like me that only do a couple of thousand a year, but the idea scenario for those that do more regular miles.

 

[Sasquatch]

Oil dilution is far from unheard of in the T6;

Search results for query: dilution

www.t6forum.com

Way ahead of you. I've done that search myself and spent some time already reading the results a few weeks ago. Very few of them were actually proven as such. Lots of speculation and questions, very little actual evidence of it. You might have enjoyed reading the myriad posts before slapping up the link.

As stated, actual genuine oil dilution is almost unheard of on these, and the few that do arise are usually the result of a fault elsewhere such as a failed injector, etc, rather than a symptom of a problem itself.

That is the basis for my claim, which you have failed to refute.

 

[DaveD]

The ideal of oil being thinned with diesel seems crasy.

"It is crazy - it is practically unheard of on the T6."

No, it's not. I'll leave it to those affected to do the research because I don't need to, but it's far from unheard of.
When your oil level rises unexpectedly it's usually caused by coolant or diesel entering the sump. It's not unheard of for it to be diesel caused by failed DPF Regens.

 

[DaveD]

Way ahead of you. I've done that search myself and spent some time already reading the results a few weeks ago. Very few of them were actually proven as such. Lots of speculation and questions, very little actual evidence of it. You might have enjoyed reading the myriad posts before slapping up the link.

As stated, actual genuine oil dilution is almost unheard of on these, and the few that do arise are usually the result of a fault elsewhere such as a failed injector, etc, rather than a symptom of a problem itself.

That is the basis for my claim, which you have failed to refute.

Nice editing. You post a comment, I reply, you change the comment!
Why do you feel the need to do that?
At least you didn't remove it altogether this time!

 

[Sasquatch]

Because I'm sat in the van on 4G while my Daughter is in her piano lesson and the connection keeps stalling. I keep hitting save so I don't lose my work, then going back and adding to it.

Not that I am under any obligation to explain myself to you. You're not the boss of me.

 

[Sasquatch]

"It is crazy - it is practically unheard of on the T6."

No, it's not. I'll leave it to those affected to do the research because I don't need to, but it's far from unheard of.
When your oil level rises unexpectedly it's usually caused by coolant or diesel entering the sump. It's not unheard of for it to be diesel caused by failed DPF Regens.

That's just pedantry now. You know exactly what we're discussing here, and it isnt coolant in the lube. The long winter nights must positively fly by in your house.

Ah, the ignore button. The first, and hopefully the last, time I'll ever require it.

 

[DaveD]

That's just pedantry now. You know exactly what we're discussing here, and it isnt coolant in the lube. The long winter nights must positively fly by in your house.

Ah, the ignore button. The first, and hopefully the last, time I'll ever require it.

my point is, although it is difficult to make while I laugh so much, is that diesel dilution of the oil is not "unheard of" or "crazy". lots of people have suffered it, really.

 

[DaveD]

Please, don't remove your comments, like when you removed the comment, "VW USE EXCLUSIVELY FORGED CAMSHAFTS", when that was proved to be wrong.

 

[Chippie1]

loving the new emojis