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Mobil 5w-40TDT #5310607 01/01/20 11:53 PM
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sibhus Offline OP
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Curious as I know this oil is generally used by the turbo diesel users but Im trying to find a commercially available 5w-40 for a Porsche 911 which generally used M1 0w40 with the A40 rating. Ive read the TDT is a good oil but wondering if there is preventing me from using it on a 85k mileage 911.

Thanks for the help.

Re: Mobil 5w-40TDT [Re: sibhus] #5310651 01/02/20 02:15 AM
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CleverUserName Offline
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I've used TDT in a diesel VW with good success at 9K mile OCI. The old spec Mobil Delvac ESP CJ-4 and 75w90 GL-5 gear oils were widely promoted by Porsche enthusiasts for racing applications. Delvac ESP CJ-4 had HQ base oils which held up under long OCIs and abuse. The current formula is different and untested.

The highest quality A40 oil on the market is Rowe 0w40. It is a true synthetic that is group IV and V. https://www.autohausaz.com/pn/14425...y5azk5gIVhMBkCh292Qj5EAYYASABEgI6pfD_BwE

Re: Mobil 5w-40TDT [Re: sibhus] #5310652 01/02/20 02:17 AM
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Olas Offline
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If it meets ACEA A3B4 it will be ok. It wont be 100% perfect if it doesnt meet A40, but for everyday use it wont make much difference.
If you plan extended track sessions on hot days in the desert A40 would be preferable.

Is there something stopping you from ordering the correct fluid from Amazon/Ebay etc?

Re: Mobil 5w-40TDT [Re: sibhus] #5310731 01/02/20 07:58 AM
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oliver88 Offline
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It is OK to use. You could also consider Motul or Redline which are both ester based oils....Or you could just run the M1 0w40 which has proven itself to be more than adequate !

Re: Mobil 5w-40TDT [Re: sibhus] #5310755 01/02/20 08:37 AM
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kschachn Online Content
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Why not continue to use one of the A40 approved oils on the same shelf at Walmart for less money? Is there a problem with either Mobil 1 or Castrol 0W-40 that sell for about $25 for five quarts, and have actual A40 approval?


1994 BMW 530i, 253K
1996 Honda Accord, 289K
1999 Toyota Sienna, 437K
2000 Toyota ECHO, 290K
Re: Mobil 5w-40TDT [Re: sibhus] #5310908 01/02/20 11:13 AM
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wings&wheels Offline
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Originally Posted by sibhus
Curious as I know this oil is generally used by the turbo diesel users but Im trying to find a commercially available 5w-40 for a Porsche 911 which generally used M1 0w40 with the A40 rating. Ive read the TDT is a good oil but wondering if there is preventing me from using it on a 85k mileage 911.

Thanks for the help.


M1 TDT 5w-40 is an excellent oil, but there may be (incrementally) better choices, especially if it is a 996/997.

What year 911?

We use M1 5w or 15W-50 in ours, but both are Summer toys only. The 5W-50 is A40 approved.


'05 Lotus Elise S/C
'85 Land Rover 90 diesel
'74 Triumph TR6
'74 BMW 2002
'72 Land Rover Series III 88"
'99 Porsche 996
'01 Porsche Boxster S (mostly Wife's...)
'19 VW Golf R (Wife's)
Piper Pa28-236


Re: Mobil 5w-40TDT [Re: sibhus] #5310939 01/02/20 11:48 AM
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Snagglefoot Offline
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Mobil TDT is an interesting oil because according to the Mobil product chart dated October 2019 is has 1300 ppm Phosphorous and 1100 ppm since but yet still has a SN rating. Perhaps the Porsche community is attracted to the high zinc, rightly or not.


If you want the job done right......do it yourself.
Re: Mobil 5w-40TDT [Re: sibhus] #5311445 01/02/20 08:17 PM
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sibhus Offline OP
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Im using this is a 997.1 S model, the issue with the 0w40 is that most owners such as myself have problem with oil burnout with the Mobil 0w40 as it seems to run on the thinner side. I have noticed with Motul my oil consumption is halved but has to be mail ordered. I like the fact that the TDT can be had at any Walmart or auto store. Ive come to realize sadly the boutique oils don't offer anything much more. But also im also after a high ZDDP and moly oil.

Re: Mobil 5w-40TDT [Re: sibhus] #5311477 01/02/20 08:36 PM
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kschachn Online Content
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Originally Posted by sibhus
Im using this is a 997.1 S model, the issue with the 0w40 is that most owners such as myself have problem with oil burnout with the Mobil 0w40 as it seems to run on the thinner side. I have noticed with Motul my oil consumption is halved but has to be mail ordered. I like the fact that the TDT can be had at any Walmart or auto store. Ive come to realize sadly the boutique oils don't offer anything much more. But also im also after a high ZDDP and moly oil.

In that case I'd try the TDT and see what happens. I tried it a while for my old BMW, but the price of the Castrol or Mobil 1 0W-40 just didn't make it worthwhile. Despite its age, oil consumption is not one of its many faults.


1994 BMW 530i, 253K
1996 Honda Accord, 289K
1999 Toyota Sienna, 437K
2000 Toyota ECHO, 290K
Re: Mobil 5w-40TDT [Re: kschachn] #5312271 01/03/20 03:11 PM
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GlennDa5id Offline
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What about Castrol Edge 5w40? Slightly thicker with A40, MB 229.3 / 229.5. Available from Wally. If not in store, 2 jugs will ship for free.

Re: Mobil 5w-40TDT [Re: wings&wheels] #5438337 05/25/20 11:47 AM
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Trix Offline
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Originally Posted by wings&wheels
Originally Posted by sibhus
Curious as I know this oil is generally used by the turbo diesel users but Im trying to find a commercially available 5w-40 for a Porsche 911 which generally used M1 0w40 with the A40 rating. Ive read the TDT is a good oil but wondering if there is preventing me from using it on a 85k mileage 911.

Thanks for the help.


M1 TDT 5w-40 is an excellent oil, but there may be (incrementally) better choices, especially if it is a 996/997.

What year 911?

We use M1 5w or 15W-50 in ours, but both are Summer toys only. The 5W-50 is A40 approved.


Awesome garage. I had not realized 5w50 was a Mobil 1 Euro Approved oil. Interesting option for a fill before any track events. I've stuck with 0w40, I suspect likely no tangible differences here. 90 degrees has to be well within operating specification.


2005 Subaru Legacy 2.5GT (Mobil 1 0w40 FS)
2014 Porsche Carrera S (A40 - Something TBD)
2017 VW Golf GTI (Mobil 1 0w40 FS)
2015 BMW 3 Series Wagon Diesel (Pennzoil Euro L 5w30)
Re: Mobil 5w-40TDT [Re: Trix] #5439791 05/26/20 10:36 PM
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wings&wheels Offline
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Originally Posted by Trix
Originally Posted by wings&wheels
Originally Posted by sibhus
Curious as I know this oil is generally used by the turbo diesel users but Im trying to find a commercially available 5w-40 for a Porsche 911 which generally used M1 0w40 with the A40 rating. Ive read the TDT is a good oil but wondering if there is preventing me from using it on a 85k mileage 911.

Thanks for the help.


M1 TDT 5w-40 is an excellent oil, but there may be (incrementally) better choices, especially if it is a 996/997.

What year 911?

We use M1 5w or 15W-50 in ours, but both are Summer toys only. The 5W-50 is A40 approved.


Awesome garage. I had not realized 5w50 was a Mobil 1 Euro Approved oil. Interesting option for a fill before any track events. I've stuck with 0w40, I suspect likely no tangible differences here. 90 degrees has to be well within operating specification.

Thanks, keeps me busy. Our 996 would consume the 0w-40, not severely, and it also was noticeably louder at startup, in a low mileage car. That is why we switched to the heavier oils.


'05 Lotus Elise S/C
'85 Land Rover 90 diesel
'74 Triumph TR6
'74 BMW 2002
'72 Land Rover Series III 88"
'99 Porsche 996
'01 Porsche Boxster S (mostly Wife's...)
'19 VW Golf R (Wife's)
Piper Pa28-236


Re: Mobil 5w-40TDT [Re: CleverUserName] #5439810 05/26/20 11:18 PM
Joined: Mar 2012
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edyvw Offline
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Originally Posted by CleverUserName
I've used TDT in a diesel VW with good success at 9K mile OCI. The old spec Mobil Delvac ESP CJ-4 and 75w90 GL-5 gear oils were widely promoted by Porsche enthusiasts for racing applications. Delvac ESP CJ-4 had HQ base oils which held up under long OCIs and abuse. The current formula is different and untested.

The highest quality A40 oil on the market is Rowe 0w40. It is a true synthetic that is group IV and V. https://www.autohausaz.com/pn/14425...y5azk5gIVhMBkCh292Qj5EAYYASABEgI6pfD_BwE

Why? What makes Rowe, a budget oil in Germany the highest quality?


11' BMW 328i xDrive 6MT (Pennzoil Platinum Euro 5W40+ MANN filter)
11' VW Tiguan 2.0T (Castrol 0W30+OE filter)
15' Toyota Sienna AWD (Mobil1 5W30 EP+OE filter).
Re: Mobil 5w-40TDT [Re: GlennDa5id] #5439811 05/26/20 11:19 PM
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edyvw Offline
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Originally Posted by GlennDa5id
What about Castrol Edge 5w40? Slightly thicker with A40, MB 229.3 / 229.5. Available from Wally. If not in store, 2 jugs will ship for free.

It is step down from Castrol Edge 0W40.


11' BMW 328i xDrive 6MT (Pennzoil Platinum Euro 5W40+ MANN filter)
11' VW Tiguan 2.0T (Castrol 0W30+OE filter)
15' Toyota Sienna AWD (Mobil1 5W30 EP+OE filter).
Re: Mobil 5w-40TDT [Re: sibhus] #5439813 05/26/20 11:22 PM
Joined: Mar 2012
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edyvw Offline
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Originally Posted by sibhus
Curious as I know this oil is generally used by the turbo diesel users but Im trying to find a commercially available 5w-40 for a Porsche 911 which generally used M1 0w40 with the A40 rating. Ive read the TDT is a good oil but wondering if there is preventing me from using it on a 85k mileage 911.

Thanks for the help.

Nothing stops you. It is good oil.
The thing with A40 or MB229.5 or LL01 is that there are stringent demands specific to small engines that will see high rates of speed etc. TDT is aimed at different exploitation.
There are numerous oils meeting A40. Castrol Edge 0W40, Pennzoil Platinum 5W40, Motul X-cess 5W40, Valvoline European Vehicle 5W40. Motul X-Cess 2nd Gen is out and looks really stout with HTHS of 3.9.


11' BMW 328i xDrive 6MT (Pennzoil Platinum Euro 5W40+ MANN filter)
11' VW Tiguan 2.0T (Castrol 0W30+OE filter)
15' Toyota Sienna AWD (Mobil1 5W30 EP+OE filter).
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