Charles Navarro

Same goes with VAG (and Porsche) recommending 5w20 or 5w30 for many models where they used to use a 0w40 or 5w40 previously. This was solely for fuel economy. I had a Macan that called for 5w20 and I used DI40 in it and the UOAs in 5k miles would be the best I've ever seen for any engine, but it lost about 15% fuel economy over the 5w20. Same goes for my current diesel Touareg - VW calls for a 5w30 and the UOAs with the factory approved oils are the worst I've ever seen in any engine. Most people who know better ignore the factory recommendations and run a proper 5w40 diesel oil instead.

To hell with improving fuel economy if you increase wear.

Jake has recommended XP6 for track use for years as well in his track builds.

Lake has been recommending DI40 for mixed street/track cars and DI50 would certainly be an improvement over FR50.

TheChunkNorris

What are you using for your Touareg? In all honesty I’ve only used DT40 in the 996 on your recommendation.

Charles Navarro

I'd stick to DT40 in the 996 for the street.

In the diesel Touareg I've been running DP40, but unfortunately the additive package that Driven uses was discontinued. They have a new CK-4 diesel oil coming out in a few weeks to replace it. I'll be switching to that and will continue testing once I run out of DP40.

There is a guy on the Audi forums that tried a ton of oils in his 3.0 diesel and Rotella 5w40 with Ceratec gave the best UOA results in his Q7. I will try adding Ceratec to the DP40 at the next oil change.

I did try running DI40 and the detergent/dispersant package can't handle the soot loading for long OCIs.

TheChunkNorris

Got it, I ask because I have a T3 TDI and use LiquiMoly, I can never find Castrol locally. Napa actually carries Top Tec 4200 so I’ve never tried anything else.

silver_tt

Just out of curiosity when you say it couldn't handle the soot loading, how specifically were you measuring this or what gave you this idea? TIA for the information as always.

peterp

Ceratec? Is it good to use with DT-40?

I've seen a lot of oil threads, don't remember Ceratec (or any oil additive) being recommended.

Charles Navarro

That was straight from Lake. He recommended against DI40 in the TDI based off my UOAs. To us it looked bad, but to be honest, it was in line with what I've seen others post online when running the VW approved oils. The wear levels were about halved with the DP40, even when running a longer OCI. He did recommend a shorter OCI of 4,000 miles, even with DP40. All I can say is that this is one dirty engine. It only sees long drives, mostly highway and towing would seem not to affect the wear levels.

Charles Navarro

Correct, do not use Ceratec with DT40. It already has a ton of friction modifiers and would not benefit from adding any more. Same goes for most every Driven street oil including DT50, FR50, DI40, and DI50 and all their race XP oils.

The only reason I'm going to try Ceratec with DP40 in my TDI is that this is a diesel oil and it has no moly in it (like most diesel oils). Plus I'm ok with experimenting on my own cars. I normally would not recommend using any additives whatsoever.

When I do recommend Ceratec to someone, I usually will do so only if they are running a suitable Liqui-moly engine oil. Doing so will ensure compatibility.

EVOMMM

Question to the gurus my techs helper accidentally put DI40 in my 99 Boxster instead of the 5w40 oil he was supposed to use
is there any down side or damage that can occur
the car actually sounds much quieter in my 300 miles of use since
thanks

silver_tt

Not a problem using DI40 at all

Charles Navarro

Correct. DI40 would be an upgrade over DT40 for any Boxster, Cayman, or 911. It's just more expensive.

ZuffenZeus

First time I've viewed a VOA on Ceratec. The anti-wear/friction reducers are off the charts!

Charles Navarro

If you add it at the recommended blend rate of one bottle per 5 quarts, that nets you a moly level around 300 ppm, so with that nets out to less than 200 ppm at our fill levels.

Both DT40 and DI40 have significantly more.

For those in the UK who might not have access to Driven, Millers Nano is another oil with high friction modifier levels like Driven.

malahhaor

Thank you all for good info. I don't have 996 but looking for something better for my 991.1 and Macan GTS. Both work fine with Mobile 1 but i dont think it has enough protection for my OCD to be comfortable and to help both cars last a long time.
Tried LiquiMoly, and Schaffer's 9000 both of which worked very well on my old Cayenne GTS, wifes F10 535 and my dads MB R350 but proven to generate allot of valve train noises on both 991 and Macan.
Just ordered DI40 for Macan, hopping it reduces noise in engine and gives good protection. Wanted to do DT40 for more zinc etc... but concerned with LSPI, Macan isn't very good about downshifting at light loads and i get up-to 8psi ffrom turbo while it wants to hold it in 7th gear at 45mph with engine lugging like a mother..

Thank you all for testing you do on this oil..

silver_tt

Do you know why Driven's website has no information or mention of DP40?