Best Oil Question, '14 Audi 3.0 TDI

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I know what you are saying

you may have had similar experience to me in that most of the low ash oils are 5w-30 but engines on that consume more oil.

We are VAG specialists and all the engines running the VW longlife (on variable servicing) oil consume quite a lot of it but when you switch the cars back to fixed interval and use the 5w40 VW505.01 C3 oil the oil consumption basically stops.

I think what you gain in having a low ash content oil you lose by sending more burnt oil through the exhaust system.
 
Originally Posted By: chrisri
GC have 1.0 ash level, C3 max level is 0.8. Basically the same.


No. Fundamentally and distinctly not the same. One is 25% more than the other. This is the whole point of the C category oils, to have reduced ash levels for extended DPF life (and/or smaller DPFs).
 
Hi weasley, thanks for correcting me, and for explanation how significant is difference between the two oil specifications. Can I ask you few questions? What would be the difference in DPF life if one car would use A3/B4 oil without any oil consumption, and car two using 0.5 litre/1000 km of dedicated C3 oil?
What do you think about using C3 oils in a modern petrols here, and going full SAPS in oil recommendations when those exact cars are sold in NA? I know NA doesn't have low sulphur petrol , but do CATs on their Euro cars last shorter then here? Would you use A3/B4 oil in a petrol car in Europe (speced for C3) with low sulphur fuel.?
Thanks!
 
Originally Posted By: riggaz
20%


1.0 is 0.2 more than 0.8.
0.2 is 25% of 0.8, so 1.0 is 25% bigger than 0.8.

Yes, 0.8 is 20% smaller than 0.8, but that's (deliberately) not what I said.
wink.gif
 
I would use the recommended oil for the market I am in. I am in the UK and I have two VW Group cars (see my signature). I use mid-SAPS VW 504/507 oils in both of them. If I were outside of the EU, where longlife oils are not recommended, I would use 502/505.

If I were out of warranty and experimenting, I would happily use a high-SAPS oil in a cat-equipped car - in fact the last car I had that I serviced myself had a cat and I used full-SAPS oil in it (2nd gen Honda CRX VTEC). I used everything from a 10W-40 to a 0W-30 in it.

As far as I am concerned, lower SAPS benefits DPFs more than any other exhaust/emissions devices (SCR, EGR, TWC etc). As I also said, lower SAPS also enables smaller DPFs to be fitted (this told to me straight from the mouth of an engine design engineer at a major OEM).
 
What about a 5w-40 VW505.01 C3 with no noticeable oil consumption per 10k vs the 5w-30 504.00 507.00 oil that consumes 2-3 litres per 10k?

(this is obviously assuming a 5w-40 is suitable for the engine)
 
Both are mid-SAPS, so the one that uses more oil will send more ash into the DPF (assuming the oil is being burnt rather than leaked and it's a diesel).

You may find a small fuel economy penalty for the 5W-40.
 
Originally Posted By: riggaz
What about a 5w-40 VW505.01 C3 with no noticeable oil consumption per 10k vs the 5w-30 504.00 507.00 oil that consumes 2-3 litres per 10k?

(this is obviously assuming a 5w-40 is suitable for the engine)


I wouldn`t expect that much difference in oil consumption.

Mine 1.4 HDi without FAP (over 200,000 km) has similar/identical oil consumption (1.3-1.5 Л /10.000 km) with three different oils (ACEA A3/B4 5W-40, ACEA C3 A3/B4 5W-40, ACEA C2 A5/B5 5W-30), respectively. All are recommended for the engine.

1. http://www4.total.fr/middle-east/uae/PDS/Auto/Total/QUARTZ 9000-5W40.pdf

2. http://www.fam.co.rs/en/products/oils-an...emium-sae-5w-40

3. http://www.fam.co.rs/en/products/oils-an...y-psa-sae-5w-30
 
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Originally Posted By: DS9
Originally Posted By: riggaz
What about a 5w-40 VW505.01 C3 with no noticeable oil consumption per 10k vs the 5w-30 504.00 507.00 oil that consumes 2-3 litres per 10k?

(this is obviously assuming a 5w-40 is suitable for the engine)




Mine 1.4 HDi without FAP (over 200,000 km) has similar/identical oil consumption (1.3-1.5 Л /10.000 km)


accidentally error in local code characters.

Just wanted to say that engine showed identical consumption with all of these oils, and it is varied 1,3 - 1,5 L / 10,000 km
 
PAS engines are different to VAG engines

VAG diesels engines always burn oil on the 5w-30 longlife oil

2-3 litres is about normal for 10000 miles on variable servicing

but the taxi drivers we've switched back to fixed interval servicing now using 5w40 vw505.01 c3 now only need about 0.5 litre in 10k
 
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Originally Posted By: riggaz
PAS engines are different to VAG engines

VAG diesels engines always burn oil on the 5w-30 longlife oil

2-3 litres is about normal for 10000 miles on variable servicing

but the taxi drivers we've switched back to fixed interval servicing now using 5w40 vw505.01 c3 now only need about 0.5 litre in 10k


Mother drives a 2012 TDI Golf. Have used the VW 507 exclusively; has never required a top off at 10k mile intervals.
 
Originally Posted By: riggaz
PAS engines are different to VAG engines
VAG diesels engines always burn oil on the 5w-30 longlife oil


Thanks riggaz, but PSA diesels are not that better than VAG diesels. I would firstly
doubt the quality of particulary (used) 504/507 oil. It is to much difference, unless the driving conditions were too different.
 
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My VAG diesel (140 bhp CR TDi) took about 1.5 litres of top-up in a 18k mile service interval, using a 5W-30 504/507 oil. I would consider that to be low oil consumption.
 
From my experience, that's low for a VAG. Usually I'm lucky to drain 3 litres from the VAG diesels in the Mitsubishis at work, after 12,000 miles. Often it's even less.

The PSA diesels don't seem to use any oil between services, the MIVEC's often seem to be making more...

We're using Castrol Magnatec Professional 5w-40 ACEA C3.
 
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