[s-cars] Synthetic oil weight rec's

[Graham Hicks]

I have been using Mobil1 is my car, but real engine builders advise against it as of late.  Not because it is no longer fully synthetic or that it is again or whatever, it has been failing in racing engines. 
Most of you will at last know the names Tuffy and or Dave Jones...that's what I'm going by.
Rotella T6 is my new staple.
See here for some info

http://forums.quattroworld.com/s4s6/msgs/43558.phtml

Sent from my iPod

On 2010-07-02, at 1:04 AM, Cody Forbes <cody at 5000tq.com> wrote:

Um excuse me, but at no point did I "berate mobil 1" nor claim Syntec to be anything. I merely stated my preference and added a bit of information about Wylie's other choice. As it turns out another lister points out that M1 may be back to full synth.

I knew I shouldn't have said anything. Torsen.

-Cody (mobile)

On Jul 1, 2010, at 9:31 PM, racingiron at comcast.net wrote:

I like Syntec myself. Don't forget that Mobil 1 is no longer full 
synthetic as of about 4 years ago.

I'm confused.

You're not alone.  I'm not a brand loyalist (I currently use both Castrol and Mobil), but it's funny to read someone recommend Castrol and berate Mobil 1 as not "full synthetic."  More than ten years ago, Castrol took some conventional stock, heavily modified it (hydroisomerized), and called it synthetic.  Mobil sued for false marketing, and the case made it all the way to the SCOTUS, which decided that these Group III oils are sufficiently modified and perform well enough to be considered "synthetic."  AFAIK, group III oils can't be labeled "synthetic" outside of North America.

Mobil held out with a pure PAO (group IV) base for a while, but even they mix in some group III these days.  It's rumored that they still have more PAO than most other major "full synthetics."  The kicker is that the group III/IV mixture actually has some benefits over strictly PAO due to better compatibility with additives and such.  Today's "synthetic" oils are so good that group III/IV content shouldn't really be a deciding factor in your choice.  Get the weight right, change it regularly, and save your worries for something else.

Eric R.
'86 urq
'92 urS
'93 urS

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