911 jared

Steve Weiner-Rennsport Systems

Bill is right about this: Porsche's recommendations have NOT been the best interests of their clients, just their stockholders. We do NOT use any Porsche branded engine oils.

Oil detergent packages have quite recently changed and CA levels have been severely reduced due to the struggle with LSPI issues (that do not affect the air-cooled cars). The consequences of these changes have yet to play out as the long-term effects of their replacements are largely unknown and unfortunately, this applies to ALL engine oils.

Times are a'changing as we speak.

spartansix

Yes - latest Brad Penn 20w50 sample showed only ~1600ppm of Calcium.

Essex

Hi guys,
I am using Liqui Moly 10W60 racing GT1 for a couple years now.
Contents;
Zn: 970-1150 ppm
p: 900-1060 ppm
What do you guys think of this oil?
Cheers

cjoenck

Joe Gibbs Driven DT50:
Calcium around 2,600
Zn around 1,100
P around 950

In the end I think changing your oil regularly is almost more important than finding the "perfect" oil - as long as you are in the right range, i.e. Bill's thoughts above.

anto1150

My car's manual calls for 5-40 synthetic, and that will be! At 170.000 km the engine looks new (opened last summer to change all the gaskets)

Goughary

Not to get into an oil argument- but if you use a contemporary "normal" 5/40 synthetic, your motor will not likely last long. The wear will be too high. Make sure the makeup of the oil is correct for a flat tappet cam motor.

Aka- in the states, Mobil 1, which used to be a very good oil, is not the same formulation that it used to be, and can not be used in our cars, but when the cars were new, it was able to be used.

As for me, there are a few right oils on the market that are highly recommended here. And i go by "if it ain't broke, don't fix it". So i have no need to switch from brad penn. cuz it is right and it works. There is no benefit in experimenting.

Bill Verburg

That's the silliest thing i've seen in a long while, and there is a lot of silliness going around

Jacke2c

Bill, I probably have more respect for you than anyone else on this board, save none. However, it may sound silly, but there was about a 3 year period somewhere around 2007-2008 where Mobil 1 was purposely reformulated with very low levels of ZDDP. Exmark, a commercial mower manufacturer would not warranty any of their products if you used anything else other than Mobil 1 in their engines and hydraulic systems, when the formulation was changed, they immediately saw an increase in hydraulic pump failures. Since, Mobil 1 has changed, but I do not know what it was changed to. When I discovered this ( I used two Exmarks on my small farm.) At that time, I switched to Valvoline VR-1, 20-50W Full Synthetic racing oil because it was the only oil available locally in Mississippi at the time.

Bill Verburg

The Environmental Protection Agency has asked for a reduction of the anti-wear additive phosphorous due to its life-shortening effect on catalysts. When the new API oil grade, SJ, was released in 1996, phosphorus levels had been lowered from a maximum of 0.12% down to 0.10%.



But the reduction was only specified for oil viscosity of 0W-20 through 10W-30 (yes, there is a zero viscosity oil). The thicker oils were not required to meet this phosphorus level. That is not to say that they won't. Additives cost the oil companies money. If they can get by with less, they might be inclined to do so. Standardizing the additive packages across all viscosity would also simplify their lives. The oils w/ the mandated ZDDP reduction are all lite weight oils and have the API Starburst label, The Oils unaffected and subject to the manufacturers whims have the older Donut label.

Some version of M1 did indeed have reduced ZDDP, but not the15w-50 that we use

here is some data
before 1995 I'd need to look it u but it was comparable to the SJ spec

Mobil 15w-50 SJ circa 1995 P- 1058 Zn-1348 this was the last spec before the US EPA stepped in
Mobil 15w-50 SH circa 1996 P- 1095 Zn-1497, this is the first year after EPA intervention
.
.All the years in between
.
Mobil 15w-50 SH circa 2018 P- 1200 Zn-1300



The ZDDP problem arose after 1996 when levels of ZDDP below ~1000 were used, 1000 is considered a floor for flat tappet engines ie all the air cooled, during the period you mention Porsche was recommending M1 0w-40, P-1000 Zn 1100. Not the best recommendation but not usually a fatal one.

Not all engines need the same amount of protection, street motors generally have relatively mild camshafts and will be fine w/ 1000 -1200ppm, race engines w/ higher lobe pressures will generally want more ZDDP

Spyerx

I love oil threads. FWIW:

my 71: gets Valvoline VR1 20w50 conventional
my 89 3.2 and 91 3.6 get Mobil 1 15w50 synthetic
My 3.6 GT3RS gets Motul 300v 5w40 synthetic

Bill Verburg

Valvoline VR1 20w50 SJ circa 1995 P-707 Zn-936
Valvoline VR1 20w50 SN circa 2010 P-854 Zn-1172

Spyerx

This is right off Valvoline website.
https://sharena21.springcm.com/Publi...2-ac162d889bd1

Bill Verburg

Just reporting the last 2 VR1 Blackstones I looked at

Here's 1

Bill Verburg

Here's a M1 15w-50