Doug Hillary

Hi,
Mark - your OP at idle (not too important I guess) is much higher than most 928 owners ever report. Regardless of oil brand and viscosity it is usually reported as being between 1.5 and 3.0 with oil at or near 90C. What is the highest you have recorded. Your oil temps are not "unusual"
What details do you have regarding operating OP - do you use additional gauges and etc.

Carl - good comments and yes Amsoil does push their product. Sadly some of their tests are not relevant for engine oils (4 ball test for one which is a test for grease), and Mobil 1 is (was) well known for being at the low end of each viscosity rating box - this has caused "perception" issues
(I used the now obsolete M1 TriSynthetic 10w-30 and 0w-40 in my Outback and Z3 2.8 respectively and both were very noisy at startup - another M1 TriSynthetic trait. They are both very different on Delvac 1 5w-40!)

Amsoil has for some time caused much consternation amongst Tribologists by not officially testing their products (most) against the API's, ACEA's and Manuafcturer's Approval criteria
They conduct their own tests which (like the 4 ball test) they promote extensively, ruthlessly and some may argue - wrongly.
I have no experience with their products but would not use them myself as better products like Motul V300 exist and are available

Many excellent lubricants exist today and I hope I have assisted in getting people on here to realise the importance of an oil's specification and not the Brand, especially for other than "normal" use

Lubricant Technology moves on and the smaller companies like RL, Amsoil, Royal Purple and etc. who purchase their base and additive products from the likes of ExxonMobil, Lubrizol and etc will never be allowed to become technology "leaders" due to their size and market position. Sadly this is a fact and even now FUCHS are embracing and marketing 0w-20 racing oils for general use that have been extremely successful in Porsche Cup events. Just like Mobil has been with their M1R 0w030 around the World. Their extremely advanced base lubricant and additive package are most likely linked. FUCHS market a SuperSyn range

All oil suppliers here in OZ now have portable oil analysis Labs with their V8 SuperCar teams at each race meeting. They check for oil degradation and wear traces after warm up, qualifying and racing. They can "fine tune" their formulations accordingly - technology apace! The Companies involved are Chevron-Caltex, Castrol, Mobil, Shell, FUCHS and etc - probably the same as in NA. The issue is that these Companies get to try very advanced lubricants here in OZ before their release elsewhere

I have no "special relationship" with any Oil Company - Castrol, Shell and Mobil are my suppliers and each for specific applications

Oil's ain't oils!

Regards

BC

Are there any tests that Mobile one has published regarding thier own HSHT tests and Noack?

Doug Hillary

Hi,
This is an old but still relevant old

BrendanC - yes specification data is freely available from Mobil and most other manufacturers too. Some boutique Oil blenders do NOT publish theirs and that is why I could not supply it on the companion thread to this one

In the care of ExxonMobil these are the latest (05/04) I could access quickly - they (except Delvac 1) apply to SuperSyn formualtions;

- in this order: rated viscosity-HTHS viscosity-NOACK

0w-30R* - NA(but thought to be 2.9) - NA
10w-30** - 3.17 - NA
0w-40*** - 3.6 - 10.5 (Porsche factory fill)
15w-50*** - 5.11 - 7 (Most widely used oil in older Porsche engines)
5w-40# - 4.1 - NA (Delvac 1 an HDEO)

NOACK readings for all except Delvac 1 will be available from the M1 website. Delvac 1's NOACK is not published but this oil is renowned for low volatility and actual consumption in use

* - A racing oil
** - HTHS below Porsche's minimum of 3.5 and should NOT be used in a 928 especially if tracked
*** - Full Porsche Appoval attained including extra NOACK type and HTHS test protocols
# - A Heavy Duty Engine Oil (HDEO) - this is a serious diesel oil suitable for mixed fleet use and approved via API test protocols (CI-4(diesel) and SL(petrol)). It far exceeds the Porsche "Approved" test protocols although it is not Porsche Approved. It will be in any future Porsche diesel engine

Remenber that there ar no "magic" oils and that no conclusive evidence exists that one oil of similar ratings is any better than another! Regardless of all the advertising hype and outlandish claims made!!

Regards

BC

Thanks again Doug.

4.1 looks pretty good for t he delvac, as obviously this the oil you have mentioned previously.

I suppose at my drain intervals of 5-7k, none of this will really matter... I'm just concerned of the extra duty the supercharger will put the engine through, even in daily driving.

Doug Hillary

Hi,
Brendan - superchargers are actually easier on engine oils than turbochargers are. Boost pressure is the issue along with combustion temps and pressures and fire belt/ring pack deposit control - oil temps too of course
HDEOs are especially good in these areas being especially formulated to live long lives in this very harsh environment
All mineral/synthetic HDEOs must have a minimum HTHS vis of 3.7 to meet API approval

Regards