Railmaster.

OK! So is it safe to use the Porsche classic oils in a 964/993? And if so, do You recomend any of them before the other?

Bill Verburg

Here are Blackstones for the 2 versions of Porsche oil
the 10w-60 is marginal for P & Zn, but has a lot of Boron which may compensate. I haven't a clue if it does or doesn't. Also has a lot of Calcium which is a detergent. Main reson not to use it is that the weight is out of spec for our engines, spec for normal or track use is 15w-50, 20w-50, or 15w-40



For the 20w-50 P & Zn are way below spec, both are in what should be considered the danger zone, But again has Born that may or may not compensate. I haven't seen any data which shows that B can compensate for ZDDP lack. Again lots of Ca.


I wouldn't want o experiment on miy cars w/ either of these but what you use is up to you.
I use mainly M1 15w-50(Sine the late '80s & Brad Penn as a supplement when oil has to be added between changes or even as a substitute for 1 qt of M1 at a normal change( reason is for a little extra ZDDP in the track car). But there are certainly several other good oil choices available. Oil choice should be data driven, It certainly helps when the manufacturers publish data, but they often don't and it further helps to see the Blackstones to see how honest they are.

Spyerx

Yeah, I saw the same one (I assume its conventional not synthetic as I think they have a synthetic 20/50 too). But date was pretty old on the test. I have some Blackstone bottles I should send one in with some VR1 I have here.

I'm hesitant to put synthetic on my 2.7, this is right from the engine build and techs. said to stay with conventional and they like VR1. They're fine with synthetic/blends on the 3.2, and prefer synthetic on the 3.6.

Railmaster.

Can I buy a additive with ZDDP and ad to the Porsche Classic oil?
And if so, any particular make?

Spyerx

Bill Verburg

According to that guy 0W-20 Amsoil Signature Series, synthetic is the best available oil, so why doesn't everyone use it??

Spyerx

for the same reason i'm not dumping additives in my oil!

Jacke2c

I wonder which Valvoline VR1 20W50 Blackstone tested.. the fully synthetic or the regular oil? There are two. I use the full synthetic because of the earlier published results.

wallra

here is what I'm running. https://lucasoil.com/products/hot-ro...w-50-motor-oil having real good luck with it.

Spyerx

Railmaster.

How about adding some STP to the Porsche Classic oil in order to higher the ZDDP levels? Will that ruin the effects of the other additives and actually harm the engine?

Quadcammer

what is your hard on for the porsche classic oil? Its expensive and not particularly well suited, and you want to spend even more money on additives that may cause an adverse reaction, why?

Just run a different oil.

Steve Weiner-Rennsport Systems

I've been doing engines since 1961 and professionally since 1972. In that time, I've learned many things but two really stand out:

1) Always used the BEST oil you can get. You won't necessarily find this out on the Internet so you should talk to engine builders who have first-hand experience. Further, car manufacturers sometimes sign marketing agreements with oil companies to increase their profits and they don't always have YOUR best interests at heart.

2) Never use any oil additives. Companies spend millions on formulating the right balance of additives into their base stocks to achieve the properties they need and adding more of anything carries some serious consequences that can be expensive.

Railmaster.

I have my car serviced once a year at an OPD and they have, apart from the classic oil, OPD service stamps for my service book.

Stamped service books are very important in Europe! Lack of one lowers the value of a 993 at least $10.000!

Quadcammer

interesting and kinda pathetic, but so be it.

I wonder if you brought oil to the dealer, they would stamp the thing.