As I mentioned in another post, I use Shell Rotella 15W-40 diesel oil. Have used it in my old 911E, 911T and never had a problem. This was the factory fill on new cars.

 

the new Rotella is not fit for a 911, according to my research.

 

What is your research, can you be a bit more specific?

 

Two well regarded Porsche mechanics here in Oz recommend and use Castrol Magnatech 15-40 and 10-40.

This sort of debate will go on (always does) for pages. I really think (personally) there is no one size fits all as it depends on age of motor, driving style , environmental conditions etc. Just my 2c worth

 

Anyone use Total Quartz 9000 5W40 (aka Elf 5W40)? The shop I use for projects too big for me used it after a major project and my engine was bone dry. Last oil change a couple weeks ago, I put in Joe Gibbs XP5 and now I've got some seepage on the valve cover nuts and the timing chain covers that wasn't there before.

 

I use Total/Elf Syntetic 5W-40 which is an API SL; Quartz 9000 is API SN, meaning less ZDDP...
Works fine in my engine. Pressure (at normal operating temperature) is 5 bar @ 4500 rpm.

 

Hey guys, thought I would resurrect this thread (from half year ago), mostly because I figure at this point, someone has decided to try Porsche's 10w-60 Classic,... yes?

I wondered if anyone (Undutched?) has found leaked info, or better yet, Blackstone tested Zinc & Phosphorous numbers on the 10w-60 as well?

I caveat & realize that the heat demands on the 964 Turbo's are not the same as NA,.. but thought I would cross-post the link to a discussion I've nudged along over in the other RL forum...

https://rennlist.com/forums/964-turb...-this-oil.html

The final few posts in that thread, are where I've ponied up some information that I've collected up to this point.

I am interested in all feedback from anyone who has tried this oil, &/or had any of it tested.

TIA,
=Steve