Other Stuff > Misc / Open

I haven't any of this in my Garage 0W/20 Sythetic Oil.

<< < (6/6)

Johnwebley:
Could be they have been "run in" to gently,

And the rings haven't sealed



Sent from my SM-A546E using Tapatalk

McCabe-Thiele (Ted):
Interesting thing about modern engines using little or no oil is often a bit of a myth in my experience  especially for short journey work vehicles  - this is anecdotal  personal experience on my older vehicles (5-20 yrs old).
Modern synthetic oils become contaminated with sulphur based oxides that are acidic,  the manufacturers add micronised chalk to neutralise the effect of the sulphur in addition other combustion products become absorbed into the oil over time replacing the actual oil used. This is worse in low mileage vehicles that often do not run at optimum temperature for many miles so also have some sump dilution from running on choke or cold start enrichment.
The dip stick level shows little or no change due to this deterioration in the oil quality as good oil is replaced by other compounds. It is when you suddenly go on a long trip say for your holidays that the oil gets hot and a lot of the water & petrol oil contaminates are effectively boiled out leading to a sudden drop in the dipstick level. Both myself & my brother have noticed this phenomena. I drove my car  about 160 miles having checked my oil before departure (oil had been in place for about 5k miles) on arrival my oil had gone from full on the dipstick to the low mark. I was quite concerned - I put a litre of oil in then checked it when we returned home - it was still full.

It seems odd that an engine would use oil for a 160 mile journey then not use any on the same retrurn distance - the above is how I have interpreted the outcome. This has been my experience with several brands of used cars over the last 20 years. Going back to the 1960-1990 it was quite different as some  oil consumption was the norm.

SteveD CB500K0:
You're probably right Ted.

The Q2 sits outside for three weeks at a time and gets used about once per month for visiting the mother-in-law (300 miles round trip)

Quite uncommon usage profile I'd imagine as we live in the town centre and walk everywhere.

5000 miles per year. 1 service per year.

I do ask myself why we own a car sometimes.

K2-K6:

--- Quote from: Rozabikes Tim on March 11, 2024, 09:41:34 AM ---
--- Quote from: SteveD CB500K0 on March 11, 2024, 09:24:02 AM ---Why would you need to top up the oil on a new car Ted?

My wife’s Audi is 8 years old and I’ve never touched it.


Sent from my iPhone using Tapatalk

--- End quote ---

Interesting....

I have a brand new Ford Tourneo. Made by VW and the same as Caddy. Flashed up needing oil at 4k miles. Likewise my friends brand new Audi Q3 did similar. Apparently VWs can do this but then settle down.....?? Spoken to Ford on mine and told to pop it in  to have it looked at. All feels a bit uncomfortable to me as likewise I thought new vehicles now us little oil. My Expert can that ive had from new does not use much...

--- End quote ---

Keep an eye on it and record of just what it does, it'll either get better or go to warranty  :(

Generally within VAG engines there's been some historic record of oil consumption, often associated with indifferent looking after, or dubious claim at least.

Theres shift in running in however from what we would call "classic"  characteristic, with many manufacturers using piston rings pre honed prior to fit as std in supply chain, with variation in metallurgy caused by adaption to low zinc type oils.

Couple this, with parsimonious fuelling and accuracy of delivering that fuel, then traditional wetting of cylinder bore from excess, consequential lubrication failure in facilitating local in engine hone condition for bore and rings, has a different look to it. Hence giving it time to "settle" is a valid route in assessing what it's going to do.
Completed well they seem to go on to complete mileage without problem. A friend with Audi A4 just sold it last year with 275,000 miles on it. A 1.9 Tdi with nothing other than cam belt and oil changes completed (we exchange tech support to help each other out ) and replacement of overrun clutch pulley on alternator.

We've an old Touran 04 plate with us from new (first as an employee company car, then bought at end of term) with 27,000 mls first oil service, 21,000 second , but now I routinely run it at 9,000 interval for oil, filter etc. Now passed 140,000 mls, doesn't use oil in between changes.

Just taken on recently a 135,000 + mls (another tech support family arrangement  :) )  a V8 40V within spitting distance of 400 bhp, run on Castrol 0W 30 for it's life, smooth and quiet, hasn't yet used anything measurable, oil stays clean too and with, ahem  ;D entertaining performance.

Rozabikes Tim:
Cheers for the normal superb technical observations.

Yes keeping an eye on things.

I had read somewhere too about lean burn engines not helping.

Navigation

[0] Message Index

[*] Previous page