Castrol RS 0-40w

Yoda · Jun 11, 2005

Both my brother (993 C2S) and I are due to have our cars serviced this month and I went into Halfords and found that they had my favourite oil on sale - £17.50 for 4 litres which seemed pretty good - just cleared out 2 shelves and got some funny looks at the counter!!!

What is the capacity of the 964 RS and 993? Are they around 12 litres each?

Offer runs "until stocks last" if you are interested.

chfs911 · Jun 11, 2005

I was told to use 15/40 Mobil One by Melv. 0/40 may be a bit thin for th RS although it is blueprinted engine. Shhould be fine on 993.

I'll take it off your hands at that price for my Corrado. ;O)

Charles

johnny senna · Jun 12, 2005

Interesting. I was told to use 10w-50 for my 993 RS. I buy my oil from Opie Oils. They are in Cornwall (I am in Newcastle!!) but they are experts and they deliver cheaply. Give this chap an e-mail about oil. His name is Guy. He works for Opie and he uses Pistonheads.

http://www.pistonheads.com/members/showProfile.asp?memberId=37408

After a long discussion with him about choosing oil he said that I should be using fully synthetic oil, especially if I am doing track days. Castrol RS is semi-synthetic. I used to use it but not any more. They don't make Mobil 1 in 10w-50 (the thickness Guy recommended for my car, no doubt he would recommend the same for your 964 RS) so I bought some Silkolene Pro-S 10w-50 which is fully synthetic and recommended by Porsche. Also, it is made in the UK. It is a fraction cheaper than Mobil 1 as well, not that this matters to me, I just wanted the best oil for my car.

Guy sells lots of oils apart from Silkolene (Mobil, Castrol, Fuchs, Motul, Total etc) but he recommended the Silkolene Pro-S 10w-50 purely on engineering grounds. See:

http://www.opieoils.co.uk/

kitchens · Jun 12, 2005

I see you are an expert on oil as well as gynaecology[

] Hope you enyoyed the Spa trip we are waiting for Gordon to edit the film,its taking longer than it took to make Star Wars.
Nice photos in your portfolio,see you no doubt at a track day ,regards from all the lads.

Brian

Yoda · Jun 12, 2005

Johnny

Its interesting to hear the advice from Guy. I posted on a thread a while back to "Oilman" (I think his name is Simon Barnard) and I am pretty sure he is from the same outfit Opie Oils - there is a good thread under "Oil Advice and Recommendations" section. I mentioned I used Castrol RS and his feedback was that the oil would be fine for my car and that 0-40w or 5-40w are what is suggested for the 964 RS. According to Simon, Castrol RS is fully sythetic but defined as "PAO" rather than "Ester" and he suggested a PAO/ester mix may give better high temp performance. It has been used in my car since 2002 and I have had no issues with leaks and I struggled to put in half a litre after several track days and a recent trip to SPA so consumption is pretty low.

Take a look here http://www.porscheclubgbforum.com/tm.asp?m=75433&mpage=3&key=

I am sure the same advice would apply to your 993 RS. If you read the thread, it suggests that a 0-40w oil would also prduce less drag and aid performance and fuel economy. Thicker oils seem to be recommended for older cars so they don't leak [

]

Regards

Melv · Jun 13, 2005

Feroz -yours IS an older car!! Use 10-40.

johnny senna · Jun 13, 2005

ORIGINAL: kitchens

I see you are an expert on oil as well as gynaecology[] Hope you enyoyed the Spa trip we are waiting for Gordon to edit the film,its taking longer than it took to make Star Wars.
Nice photos in your portfolio,see you no doubt at a track day ,regards from all the lads.

Brian

Hi Brian,

It was good to meet you fellas too. Spa was a great trip, I'll be there next year.

Me, an expert on gynaecology? I'm as rubbish as the next man!

johnny senna · Jun 13, 2005

ORIGINAL: Yoda

Johnny

Its interesting to hear the advice from Guy. I posted on a thread a while back to "Oilman" (I think his name is Simon Barnard) and I am pretty sure he is from the same outfit Opie Oils - there is a good thread under "Oil Advice and Recommendations" section. I mentioned I used Castrol RS and his feedback was that the oil would be fine for my car and that 0-40w or 5-40w are what is suggested for the 964 RS. According to Simon, Castrol RS is fully sythetic but defined as "PAO" rather than "Ester" and he suggested a PAO/ester mix may give better high temp performance. It has been used in my car since 2002 and I have had no issues with leaks and I struggled to put in half a litre after several track days and a recent trip to SPA so consumption is pretty low.

Take a look here http://www.porscheclubgbforum.com/tm.asp?m=75433&mpage=3&key=

I am sure the same advice would apply to your 993 RS. If you read the thread, it suggests that a 0-40w oil would also prduce less drag and aid performance and fuel economy. Thicker oils seem to be recommended for older cars so they don't leak []

Regards

Hi Yoda,

Guy was certain that a fully synthetic ester oil is better for car doing track days, even older cars like ours. Our engines are obviously very similar. In fact he didn't classify our engines as being "old" when it comes to picking an oil. Sure, he wouldn''t put Mobil 1 0w-40 in there like some modern cars, but he didn't think that semi-synthetic would necessarily work better in our cars due to their age.

I just wasn't happy to buy Castrol RS after what he said. He said that the ester fully synthetic oils were the most stable and the highest quality. In terms of the weight of the oil, the "10w" part he thought was ideal (important for when you start the car, not too thick or thin) but he believed that the "50" part of the oil was best for the track, i.e. when the car was very hot after 6-7 laps. He said the fact that the oil was an ester one was also important in this regard, he thought that it was safer than Castrol RS in these circumstances.

After listening to what he had to say, I couldn't see any actual advantage in using Castrol RS, that's for sure. All IMHO of course.

johnny senna · Jun 13, 2005

Here is a bit of the thread where Guy was answering questions for people on PH's Porsche forum:

http://www.pistonheads.com/gassing/topic.asp?t=124186&f=48&h=0&hw=oil+993rs

I said:
"opieoilman,
I wonder what you think of the oil I have in my 993 RS, castrol RS 10-60? Surely a large viscocity gap there?
Many thanks."

Guy said:
"Johnny,
I am afraid you are using very much the wrong oil here. Porsche recomend a 5w-40/0w-40 for all modern engines and only go upto 10w-50 under extreme track use.
The RS 10w-60 is not a true synthetic and does not carry the Porsche approval.
I would change to something else that is Porsche approved as the poor car is going to be choking trying to pump this around.
Cheers
Guy".

So I said:
"Right, I'll look into it!! The thing is, my car IS used under extreme track conditions.....full tilt for 2 days at Bedford last weekend is an example, then 2 days at Spa in May.
Perhaps Mobil 1 15-50 is in order? Or is that too thick? You never see anything other Mobil 1 for sale other than 0-40 and 15-50, or am I not looking hard enough? Or what 5-40 or 10-50 oil should I use?"

So he said:
"If you are doing hard track work then in my opinion the Castrol really aint upto the job even if it is the right grade, because it is a mineral based oil it will shear down under hard use, so with a few hours on the track your 10w-60 is functioning as a 10w-50, then 10w-40 and so on until your left with dish water.
True pao and pao/ester synthetics have uniform base molecules so are very shear stable, so after a few hours on the track, the true synthetic 10w-50 will remain a 10w-50 and so on.
Mobil 1 is very good but Porsche do not recomend a 15w for the car, ideal oil for you is the Silkolene Pro S 10w-50 ester/pao synthetic.
Ester based oils are even higher quality then the straight pao oils like Mobil 1 and even more stable yet again as they are actually polar.
Make sure your oil is Porsche approved.
If you would like more info on suitable oils for you car, just drop me a mail through my profile.
Cheers
Guy."

I thought this made sense, so I went for it! (The Silkolene that is).

964rh · Jun 13, 2005

Just to chuck my two pence worth in.

I'm using Castrol RS in my C4 and Simon advised me not to use for all the reasons on other posts. He advised changing to Silkolene Pro S. for normal and occasional hard usage.

Rob

Yoda · Jun 13, 2005

Thanks for your input guys, seems like a clear message from Guy. I wonder why Simon's advice was different. The Castrol RS I am using is 0-40w (rather than 10-60w) which I believe is a pao fully syntheitic type. I may try and see if there is another oil expert with an opinion.

Mel - thanks for reminding me [

][

]

Johnny/Rob - see you at Donington on Friday and you can tell me all about Esters.

johnny senna · Jun 13, 2005

ORIGINAL: Yoda

Johnny/Rob - see you at Donington on Friday and you can tell me all about Esters.

No problem mate, I shall bring along a postage stamp with everything I know about esters written on the back of it. [

][

]

Yoda · Jun 13, 2005

I just picked up my car this afternoon having had some new MPSC tyres and Pagid Blues up front and asked what oil they put in my car at the last service. Castrol RS fully synthetic, best ting for cars of that age. What grade I ask (fully expecting them to say 0-40w)? Oh, 10-50w they reply.

I didn't know they made 10-50w Castrol RS!! Now I'm even more confused. I can only presume he means 10-60w. Even the advice from 2 different guys at Opie oils seems to contradict one another - one says it is mineral, the other says PAO synthetic (the Castrol website says PAO synthetic so I am inclined to believe them). One says 0-40w is ok, the other says absolutely not.

I trust Steve at Jaz, hasn't disappointed me yet so I think I'll let him continue with what he is putting in there at the moment. Oh well, looks like the 0-40w is going in the wife's Audi!!!

Thanks for all of the feedback.