Time for annual oil change and have heard lots of comments about Mobil 1 5w-40 TDT and Mobil 1 5w-50. Couple of questions:

1) Is the 5w-50 Porsche approved and if so what are some sources in US to find it? Is this weight OK for year round in NC?

2) With the TDT, and higher ZDDP levels, is there concern of catalytic converter damage? Seems like I read on the Mobil web site that it may cause problems?

Thanks for the feedback.

Keith

 

1. Yes, M1 5w50 is on the the approved list

2. The new diesel oils are formulated for vehicles with cats. 07 and newer diesels have cats. TDT and Delvac 1 are ALSO approved for gasoline engines- says so right on the bottle. Mobil will also tell you it's perfectly OK to run diesel oil in your gasoline car.

Oh, and 3- ANOTHER OIL THREAD?

 

Yes! Porsche dealer in Taiwan all use M1 5w-50 for local hot and humid climate.

 

I went looking for 5w50 and it was really hard to find anywhere online... if you do -- let us know!

 

http://store.avlube.com/mobil15w50.html

Just bought a few cases and delivery was very fast.

If the link is a problem just search-- Mobil 1 5W-50 avlube

 

Is the Mobil 1 5w50 the one that still has higher zddp like the old Mobil 1 formula?

 

Interesting comments from Mobil when I asked about using the 5w40 TDT and whether it would damage catalyst.

 

I get my M1 5w50 at Grease Monkey in Denver. They are a Mobil dealer and stock it. Around $6 per quart.

 

I ordered 6 cases of 5w-50 from the same place a couple of days ago. With shipping, it came out to about $50 per case of 6. Still not bad.

Btw, they were on sale.

 

I talked to several local experts and they all recommended M1 or Castrol 5w40 or 5w50 gas motor oil, others they thought were good was BG, Redline, Amsoil, and Motul....I asked about the TDT stuff and they told me to stick with the oil for petrol motors ... and simply added the BGE MOA for the zddp...

 

Nope, same ZDDP content as 0w40.