My brother sent me this link and I thought some of you might find it interesting.

http://www.audiworld.com/tech/eng14.shtml

 

Interesting...

 

oil is oil. 5w30. synthetic is a waste of cash. change your oil more...thats all!

oh yes, synthetic also causes premature wear on gaskets


[Modified by Soup ****, 2:35 AM 7/29/2002]

 

Thanks, that's a great article.

 

Yep, almost everyone in Europe uses 10W-40 or 5W-40.
xW-30 oils are not available here....

 

I am using 10W60 Castrol racing.....
If this might cause higher temperature, could this also be the cause for my knocking-problem ??

 

Not true... there`s even 0-20 out in Europe

http://www.castrol.ch/DEUTSCH/consum1.htm

But please tell me, why Castrol writes this:

Castrol RS Racing Syntec 10W-60
API SJ/CF
Vollsynthetisches Motorenöl der Spitzenklasse mit SAE 10W-60 Viskosität bei zeitweiliger oder renntypischer Höchstbelastung. Für serienmässige, getunte und turbobestückte Motoren.


Means 60 viscosity for temporary or racing-typical engine stress..
Made for stock, modified (!) and turboed engines....


So if high viscosity is not good for engines, why does Castrol recommend their 10W60 exactly FOR raceing-engines like the b18c, even when it`s modified.
Can somebody answer that ?





[Modified by ITR1858, 12:51 PM 7/29/2002]

 

I mean at the shops. I've never seen xW-30 or lower oils in the car parts shops.

10W-60 could be too thick for street. It's for track use (>100 deg Celcius oil temp).
It is for modified engines but mainly under high load (maybe autobahn).
You can try he Castrol RS 0W-40, it's the same formula but thinner.

BTW BMW uses Catrol 10W-60 for their M engines.


[Modified by DutchITR1689, 12:55 PM 7/29/2002]

 

Maybe they mean: Made for modified and turbo engines when under racing stresses....

 

Yes, but according to the article there will e a power loss and higher temperature, what is never good for engine parts....

So if friction is higher and power gets lost, why should anybody use this oil ?

BTW, I`m running my engine everytime above 6k.... even on street.

 

Yes, it could cause higher temps and reduce power. But you need it at high temperatures!! Because normal 5W-40 oils will be too thin at high temps and therefore it will not lubricate the parts properly...

You need a oil temp meter to see how high your oil temp gets. If it remains lower than 100 deg C, 5W-40 or 0W-40 is fine. You can also try 10W-50 for in between...

I use 5W-40 from Honda on the street and Castrol RS 10W-60 at the track when possible.

 

Something for youall to think about. My first lab results that are posted in the oil thread show that 5W30 isn't holding up well enough...

 

You just got through saying that oil was oil. Can you show the article (not some "opinionated" H-T thread, but facts) where you got this information? I am curious to learn more.

 

I personally am running Castrol Syntec 5w-50 right now because a case was given to me for free after winning their HP dyno shootout. I notice no loss in performance, or higher engine temps. I think oils pretty much oil. Change it regularly and be happy.

 

oil <u>is</u> oil. however there are additives in synthetic oil that causes premature wear on gaskets. which is why i dont use it. do a search if you want more info. there was a huge debate about it a while ago., but i was alerted a long time ago by my mechanic friend who works for Lexus.

also...
1 synthetic oil change = 2 normal oil changes (even with the cost of 2 filters)

i'd rather switch out at 2500 miles using regular oil, opposed to switching out maybe 3000 miles for synthetic.




[Modified by Soup ****, 10:25 PM 7/29/2002]

 

A few friends of mine race a RX7 which during an enduro (or even near the end of a normal SAARC race) starts to read very very low oil pressure. THey are running 10w-30. Running higher weight oil will help prevent this issue and drop in oil pressure.

 

I did a search but have not found TRUE evidence of this (most of the articles I find have been people flaming syn oil because they "heard" this or that). I'm saying this in the nicest way possible (and not flaming you), but you are speaking without true knowlege. Why does Audi suggest that synthetic oil be used with thier turbo engines. Tubos put added stress on seals and so-forth, would you not agree? Go to the audi forums for your answer, they are actually pretty knowledgable over there. But I think that you are taking everyone else's word for it, rather than looking harder for proper non-bias information.

Are you talking about cost, (hopefully you are) because this is true. But I am still sticking with synthetic. Cost = no object when it comes to reg maint.

 

FWIW: I have been using Valvoline synthetic 5w30 for over 40,000 miles on my R which includes 4 track days, at least 20+ passes at the drag strip, 2 years of auto-xing, and plenty of fun highway/mountain runs. My car doesnt burn a lick of oil. Even if I go over a little in mileage before my next oil change...its still perfect.

Thats the only evidence I can go by as to know whether synthetic works.

 

Very interesting!

Thank you,

A.

 

This is a quote right before closing in the above linked article:

"Synthetic oil
is vastly superior to conventional oil of the same grade in its
low-temperature pumpability, high-temperature stability, long-drain
capability, and high lubricity (low friction). However, all these benefits
may not be apparent in a car used in a temperate climate, with oil
changes at intervals specified by the owners manual. "

I tend to agree based upon what I've read and seen but, it's always nice to read and see someone well versed explain these types of topics. And BTW, the " deterioration of seals" thing with Synthetic has definately been a heated topic here before, But, I have to agree that I have NOT seen any conclusive evidence that this is true. As a matter of fact I remember a post awhile back that totally debunked the theory of the "Evil Synthetic Oil!"

This is not my expertise and I will leave the explanation of this topic to the professionals and those with superior knowledge. I for one use Synthetic currently and have for 10,000 miles. I did NOT go straight to Synthetic. I waited till the 10K mile mark so things could be broken in well and seated properly.

Several other Professional Mechanics have also explained to me that the B18C5 doesn't really start to feel it's maximum potential till around the 20K mark.
Is this True?
I dunno...
My car has felt stronger and faster with Every new day since the purchase date. Of course thats probably because I am continuing to learn how to drive her better.

Nuff said,

A.

PS BTW, Tom, I too am not trying to flame or pick on you. but, I have also seen those threads in the past and just never saw proof.

 

I've thought about running 5w40 because of the burning issue.....

a person had their Mobil 1 analyzed and it had dropped from 5w30 to 5w20 over time. running 5w40 seems to be the sweet spot for me....but if I can only find 5w30 then that's what it is.

edit\\\ I run this car hard...


[Modified by Tweakmeister, 6:34 AM 7/30/2002]