'03 VW Golf TDI - Delvac 1 5W-40 - 12,496 miles *yawn*

[pezzy669]

Well here is another oil analysis from my '03. Oil was in from Oct 26 to May 26 (exactly 5 months). Mileage is about 65% highway/35% city driving. On the freeway we cruise 85-90MPH, in the city just the speedlimit but wind it out to 3000-3200 RPM before shifting. Car took 6 long road trips purely freeway at 85-90MPH - So about 5000 miles of this interval was cruising on the freeway.

All I have to say is *yawn*, makes me wonder why I pay $30 every oil change for these...actually I do know - I like seeing how my engine is doing. I am happy to see the iron wear did not increase despite the 2,000 extra miles on this interval (24 must be my lucky number). Other then that most everything looks just as good as my last two intervals. I did run a few shock treatments of Redline Diesel Catalyst as I ran no Powerservice this interval, but I guess it did not skew the results. I am now using Lucas Fuel Treatment every fillup.

I know somone had mentioned TBN looked low last time I posted. From what I understand Blackstone has a different test method that reports lower then usual and to add 2 points to get the actual TBN or something like that. TBN was 4.7 this time and I think 6.8 last time when I ran 10,4XX miles.

 

[SSDude]

Where are your numbers?

 

[pezzy669]

I guess TDI club wont let me post the pic over here. Let me throw together something. Sorry

The first column (most recent) is my 52.9k analysis, 2nd is 40k analysis, third is the 30k analysis.



Aluminum - 5/4/3
Chromium - 2/2/2
Iron - 24/24/24
Copper - 4/3/3
Lead - 1/3/2
Tin - 0/1/0
Moly - 2/1/1
Nickel - 1/0/1
Manganese - 1/1/1
Silver - 0/0/0
Titanium - 0/0/0
Potassium - 0/0/0
Boron - 21/18/1
Silicon - 5/5/3
Sodium - 2/2/2
Calcium - 2451/2815/3509
Magnesium - 463/462/116
Phosphorus - 1102/1101/980
Zinc - 1326/1386/1154
Barium - 0/0/0
TBN - 4.7/6.6/6.2

Sus Visc @ 210F
Should be - 67-78/64-76/66-78
Tested at - 76.4/78.0/73.6
Flashpoint
Should be - >410/>415
Tested at - 440/455F/455F
Fuel - .5%/.5%/.5%
Water - 0/0/0
Insolubles - .5%/.3%/.4%
Antifreeze - 0/0/0

Sorry bout that.

[ April 07, 2005, 01:33 AM: Message edited by: pezzy669 ]

 

[TooSlick]

What was the oil used in the third analysis @ 30k? It looks like it may be the Shell Rotella T, 5w-40 perhaps?

Despite what you may have heard, the TDI engine is very easy on the oil. That's why in Europe the maximum change interval on some of these is 50,000 km, as opposed to only 30,000 km for something like the 2.0L, gas engine. The difference has directly to do with total fuel consumption over the drain interval. The TDI gets approx 50 mpg, vs only 30 mpg for the 2.0L. The sump on the TDI is also 4.8 qts, vs only 4.2 qts for the 2.0L. If you recall my "OCI Formula", fuel efficiency and sump size are two of the key parameters.

OCI = (C*)(mpg)(sump/qts)(Cubic Inches/Hp^)

Note: C* is a constant derived from oil analysis data of the specific lubricant

Note: ^for diesels, use ft-lbs of torque instead

Tooslick

 

[pezzy669]

Yeah I ran Rotella T Synthetic 5W/40 from 20k-29.9k (sample was 98XX miles).

During an oil change I can only squeeze in about 4.2 quarts (thats with sucking about .2 quarts out of the oil filter housing and oil cooler).

I will probably stick with Delvac 1 from now on. Despite being more expensive then Rotella it still only comes out to about $40 per oil change (not including analysis) and it looks like I could go probably 15k on the stock filtration system. Not too shabby for alittle over a gallon of oil.

 

[truav8r]

TooSlick.... what constant "C" do you like for Delvac1 for the 1.9L TDI?? I just love your OCI formula

 

[TooSlick]

Based on the many dozens of oil analyses I've seen on the TDI Forum in the past five years, I'd say a C* of 120 would be about right for the 12 TBN, PAO based,synthetic diesel oils like Delvac 1 and the Amsoil 5w-30/15w-40. You'll find this yields OCI's closer to 20,000 miles than 10,000 miles. Of course VW only specs their light duty, 505.00 formulations for this application. So that makes sense to me ....

Note that the OCI's for the PD engine will be a bit shorter, since their fuel efficiency is lower and they generate 177 ft-lbs of torque, compared to 155 ft-lbs for a stock "A4", TDI engine.

By the way, C* is used to represent combustion efficiency in liquid rocket engines.

Ted

 

[pezzy669]

TooSlick:

When using your formula I come up with ~15,000 miles for my TDI (ALH) which seems about right. Mine is a 5 speed and I only average between 40-43 MPG because I drive it as to not **** off the people behind me (3000-3200 RPM shift points after warmup and 85-90MPH on freeway).

I know Blackstone was being quite conservative in recommending 13.5k for my next interval but I am just going to stretch it out to 15k miles and depending on my next UOA probably stick with 15k on my stock ALH TDI. The only thing I do not like about extending the intervals is it really screws up the fuel/air/cabin filter services which now have to be done between oil changes. But those are easy enough and can be done in under 20 minutes so no biggie.