Frequent oil changes bad for PD???? check this out....

[gldgti]

from the same thread immediately before the quoted post

"Politics, sex, motor oil: the three topics most likely to yield nonsense and bad advice on the Interwebs? [g]

Just a quick comment: "detergent" oil does not, contrary to popular belief, contain dishwashing soap or the equivalent [g]. It does not "wash" anything. Instead it holds dirt particles in suspension, which is why it gets darker in color faster than non-detergent oil (if you can even find such a thing these days), which lets the particles settle out."


Not wanting to incite anything but I just have my feelings about emotive posts. The TDI post is a good read just the OCD comparison struck me as unusual parallel.

fair enough, and not a lot of chance of inciting anything but good discussion in our cosy little corner of the forum. I do realise that oil doesnt contain dishwashing liquid (i use dishwashing liquid to get engine oil and grease and dirt off my hands almost every weekend, such is the life of keeping 3 cars over 15 years old running by yourself). Perhaps I underestimated the readership and oversimplified my expanation - I only indended to bring conceptual understanding, and in this I do not believe I have been in error -

engine oils (particularly diesel oils) contain detergents to clean the inside of the engine. The idea is that as the oil runs around inside the engine it picks up any foreign matter, soot particles and dirt, and these are trapped in the oil filter

and transporter, sorry to be picky, but

otherwise it would mean that if you pour new oil in the engine and didn't drive it at all it would corrode and the oil would leak out

is not what i was trying to explain. Any corrosive component is "used up" whenever there is a reaction, and thus the concentration of corrosive chemicals in solution (if allowed to react) will decrease logarithmically (I am trying to say "upside down exponential curve") over reaction time. I do, however feel that it is likely that any troubles would be more realistically attributed to using oil that contained the wrong friction modifiers or lacked them completely, as you say. I only pick this up because I dont want to you to publically interpret what I have said wrongly.

[Transporter]

fair enough, and not a lot of chance of inciting anything but good discussion in our cosy little corner of the forum. I do realise that oil doesnt contain dishwashing liquid (i use dishwashing liquid to get engine oil and grease and dirt off my hands almost every weekend, such is the life of keeping 3 cars over 15 years old running by yourself). Perhaps I underestimated the readership and oversimplified my expanation - I only indended to bring conceptual understanding, and in this I do not believe I have been in error -


and transporter, sorry to be picky, but is not what i was trying to explain. Any corrosive component is "used up" whenever there is a reaction, and thus the concentration of corrosive chemicals in solution (if allowed to react) will decrease logarithmically (I am trying to say "upside down exponential curve") over reaction time. I do, however feel that it is likely that any troubles would be more realistically attributed to using oil that contained the wrong friction modifiers or lacked them completely, as you say. I only pick this up because I dont want to you to publically interpret what I have said wrongly.

You're 100% correct in your post. I didn't say that you were wrong, and wouldn't want anyone to interpret it like that.

I simplified my expression and said it in the way that even not mechanically minded reader would understand. I also said that "as well as detergents engine oils contain anti corrosion additives."
Just to be complete in what I mean that you're 100% correct is that we both know, and almost everyone who does his own oil changes that, there are anti corrosion additives in the oil and properly formulated approved engine oil can't corrode the engine unless is too old or incorrectly stored and additives in it are depleted. And yes, if there was just detergent without anti corrosion additives the metals in engine would corrode.

[gldgti]

hehe, i think, finally, we are all 'clear'.

[coastie]

Yes the detergent comment wasn't mine but in the quote from the other forum.

[Buller_Scott]

hey guys, thanks for explaining it to me, and especially for the back-and-forth! always educational.

now that im a ''man of leisure" [unemployed derelict bum], im really, REALLY getting into the whole educational side of owning a tdi for sure!

thanks also, transporter- i didnt realise that UOA didnt test for internal sludge/ debris.... and that was definitely the thing that i was most ''concerned'' with, in my effort to do what's best for the little hairdresser's car.

so it's looking like regular 15k services, with self-done 7.5k oil changes in between

cheers guys!

scotty

[Transporter]

Scotty here is good info if you still want to read more, it might be boring to some, I enjoy it.

I think it is in one of the post above, just in case you missed it.
Topics

The mos important is that, if you use any chemical that is for automotive use, always use in as per instructions, since some components are very expensive to replace and the damage caused by incorrect use doesn't have to be immediately evident.

[Buller_Scott]

Scotty here is good info if you still want to read more, it might be boring to some, I enjoy it.

I think it is in one of the post above, just in case you missed it.
Topics

The mos important is that, if you use any chemical that is for automotive use, always use in as per instructions, since some components are very expensive to replace and the damage caused by incorrect use doesn't have to be immediately evident.

oooh, reading material! well i know what i'll be doing today...

just went through to one of the ''chapters'' as listed on the front page- this is an AWESOME resource!

cheers transporter

scotty