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#586173 - 12/10/02 03:10 AM Re: VW Passat TDI Rotella T Synthetic
TooSlick Offline


Registered: 08/02/02
Posts: 5785
Loc: Dixie
Al,

Not really an issue of viscosity, but rather thermal decomposition of the oil in the area of the upper piston ring. This engine is designed with a small "crevice volume" and the upper ring is in a very hot zone. Conventional oils tend to coke in the ring grooves and the rings stick. This is when you start to see elevated levels of both Cr and Fe in the analysis. You really want the PAO based synthetic in this particular application.

You can't fix this one simply by changing to a synthetic oil once it has started. You need to take the engine down and do it the right way. I have seen several cases where the Cr and Fe levels dropped a bit after synthetic was used for an extended period, so perhaps some of these deposits were loosened up, but it's a halfway measure.

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#586174 - 12/10/02 03:39 AM Re: VW Passat TDI Rotella T Synthetic
Al Offline


Registered: 06/08/02
Posts: 13581
Loc: Elizabethtown, Pa
Thanks [Smile]

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#586175 - 12/10/02 05:10 AM Re: VW Passat TDI Rotella T Synthetic
Andy H Offline


Registered: 12/08/02
Posts: 143
Loc: San Antonio
Thanks for the words, TooSlick.

I don't know what the first owner used for oil. It was a VW lease, so I hope he at least used the Syntec from the stealership.

I used Mobil 1 and the Valvoline semi-synth for the first 4K changes after I bought it. Once I digested enough of the oil info on Fred's I switched to the AMSOIL.

I pulled the intake manifold right after I bought the car and cleaned it out. It was almost 60% blocked. The clogged intake had masked that the MAF had failed. I certainly wish I had this car from new...

I've got 6K on the current oil, I'll get some to the lab this week. And it looks like I'll be ordering a pan gasket...

Thanks Al and Sprintman for the Delvac 1 info. I can get the AMSOIL for less and I'm really looking forward to running the 5W-30.

(digging around...let's see..I got a 10mm socket here somewhere...) [Frown]

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#586176 - 12/10/02 02:00 PM Re: VW Passat TDI Rotella T Synthetic
jjbula Offline


Registered: 07/04/02
Posts: 479
Loc: Montgomery, AL
quote:
Originally posted by TooSlick:
Al,

You can't fix this one simply by changing to a synthetic oil once it has started. You need to take the engine down and do it the right way. I have seen several cases where the Cr and Fe levels dropped a bit after synthetic was used for an extended period, so perhaps some of these deposits were loosened up, but it's a halfway measure.

I'm not trying to push this stuff, I'm just thinking of buying a used TDI and am curious about your opinion. Would Auto-RX or another proven cleaner do the job without a teardown?

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#586177 - 12/10/02 10:12 PM Re: VW Passat TDI Rotella T Synthetic
TooSlick Offline


Registered: 08/02/02
Posts: 5785
Loc: Dixie
JJBULA,

I was just thinking that it would be worth it for Andy to try the AutoRX in this TDI engine. I'd run it in there with 4 quarts of a 15w-40 petroleum based diesel oil like Delvac 1300. Run it for 500 miles; change the filter, topoff the crankcase and run another 500 miles before doing a total change.

It's worth a shot for $25.00 and may reduce the problem to a managable level.

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#586178 - 12/11/02 02:37 AM Re: VW Passat TDI Rotella T Synthetic
sprintman Offline


Registered: 05/27/02
Posts: 11005
Loc: Canberra ACT Australia
TooSlick, my thoughts exactly. Gotta be worth doing IMO.

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#586179 - 12/13/02 06:55 AM Re: VW Passat TDI Rotella T Synthetic
TexasTDI Offline


Registered: 09/16/02
Posts: 371
Loc: TYLER, TEXAS
quote:
Originally posted by sprintman:
Andy
You should give Delvac 1 a go in that engine. Most TDI owners use it now I hear. Several people here have found it for $10 gallon if I remember correctly, obviously mispriced.

Delvac-1 doesn't meet VW 505 specs, Amsoil does. [Big Grin]

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#586180 - 12/13/02 06:59 AM Re: VW Passat TDI Rotella T Synthetic
TexasTDI Offline


Registered: 09/16/02
Posts: 371
Loc: TYLER, TEXAS
quote:
Originally posted by Andy H:
The current fill is AMSOIL 15W-40 Diesel/marine, which has 5600 miles in it. I'm looking forward to comparing the numbers.



I'm also using Amsoil 15w-40 in my 2000 Golf 1.9TDI and my 1991 Jetta 1.6 Diesel. [Big Grin]

quote:
The next fill will be Amsoil 5W-30....
Series 3000 I hope. [Wink]

I'll be switching to Series 3000 5w-30 at my TDI's next oil change as well. [Cool]

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#586181 - 12/18/02 08:52 AM Re: VW Passat TDI Rotella T Synthetic
Andy H Offline


Registered: 12/08/02
Posts: 143
Loc: San Antonio
Hi All,

Chris, of course Series 3000! I got my bypass filter in the mail today as well. I'll do the oil and flushing and bypass change sometime this holiday break.

TooSlick and jjbula - What's AutoRX? Some type of flush? I thought of using a flush in the oil and maybe drizzling some in thru the intake valves and letting it soak down. Not sure how effective that would be. [I dont know]

I'm not sure if the rings would seat again if I pulled the bottom off and reinstalled the pistons...then all the "as long as I'm in here's" started calling...by the time I was done with my mental exercise, I had a fresh overhaul. [Roll Eyes]

I sent an oil sample to the lab last week and will take a look before the next step.

To be continued, me thinks...

Merry Christmas all,
Andy

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#586182 - 12/18/02 09:31 AM Re: VW Passat TDI Rotella T Synthetic
Giles Offline


Registered: 12/02/02
Posts: 403
Loc: California
Consider Lube Control and Fuel Power for cleaning the engine.

Here's some links of interest:
http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=5;t=000106#000025

http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=5;t=000112#000003

I ordered some and will be giving it a try.

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