I only use castrol in my old VWs. Big believer in it.

Side note: Now that's thinkin' with your dipstick!

 

Pulled into Autozone last night for a quart of oil. I'm running Redline, which is awesome btw. Saw Valvoline Racing synthetic 10wx 30. Anyone use that?

 

Whether Castrol or Mobil 1, they're both good oils and above the average spec. Alot has to due with oil consumption. A person may think they're consuming more oil of one type more so than the other. Maybe you are, but also remember driving habits also have to do with the usage factor just as weather does.

 

i only put in royal purple n have never had a problem with it?

 

I have used both. I tend to lean toward castrol syntec. i think mobile1 has changed giving castrol the edge in the contest. As far as the factory fill, what does that matter its typically who they are aligned with such as racing or who gives the better deal. The weight and viscosity are the key as well always full synthetic.

 

man im glad someone posted this. ive got 94k on my 8. ive used mobile 1 10w 30 every 3500 miles or so. the car has never used any oil by the dipstick, but here recently ive been told by more than one person that im throwing some blueish white smoke under acceleration. i checked compression and all is good. ive been wanting to try a different oil but was apprehensive about switching. i think im going to give castrol a try next change to see if it makes any difference.

 

A friend told me when I was going to use it "You're just paying premium for the purple dye. Use Castrol". Personally, if you're going to pay Royal Purple price, go Amsoil. It'll be a lot better.

 

well, see, the thing is, I've burned a quart by 3k EVERY oil change since brand new. I've gone through multiple seasons and the car has seen all sorts of driving. The first time I switch to Castrol, I end up burning zero. I haven't driven my car any differently either...maybe if it was a span of a few hundred miles, but my driving is pretty consistent over a few thousand miles.

 

This thread has tons of statments that are not even proven. Like the one above. You really think royal purple is just a gimmick because it is purple?? Alot of the things being said are just from people who praise it because they use it. Why dont you post up some real test that prove all of your "theorys". I wil look for some actual test that were in a non-biased performance mag i used to have that showed mobil 1 and royal purple to be the best protecting under all driving conditions. Let me try and find it and i will post it up.

 

I've also had this problem with Mobil 1 in the past with other cars, I personally like the Valvoline Vr1 line alot of engine builders I know use this.

 

Here is just a tiny bit from a full on pro oil test. Including HP test, wear protection, viscosity. The oils were all put to the same test.

Overall results:
CONCLUSION
There are many names, numbers, values and suggestions throughout this article, and to an extent many of the results show how even the oils are. The one point proven is just how much better synthetic oil is over a "mineral" or petroleum based product.

In the case of a pure performance or race engine where power is priority and oil changes can be frequent, the 0-30/40 oils such as the Mobil 0-40, Castrol R, or Royal Purple would be best suited. However, for regular street-driven engines, it would be better to look at an oil with a good service interval.

An overall analysis of the 11 oils suggests in any case, see your owners manual for the recommended grade of oil. Torco and AMOSIL supplied the "recommended" oil for our testing, but added if it were an outright horsepower shootout, they too would have supplied a zero weight oil.

Although we've provided criteria to pick and choose an oil, the stand-out to us appears to be the AMSOIL, rating well in the viscosity and producing good horsepower.

In the 0 up to 40 weight category, it seems Mobil's new 0W-40 produces terrific power, insignificant viscosity loss and a middle-to-fair wear particles rating.

With the variety of grades, use this test as a guide but always follow the manufacturer's recommendation. But if we were to stick our neck out in anticipation of the law suits, from the information we gathered specific to the supplied oils in this test, we'd rate the oils in the following order:

1. AMSOIL
2. BP Visco 5000
3&4. Both Mobil 1 (difference between price)
5. Hi-Tec HTO
6. Shell Helix Ultra
7. Royal Purple
8. Castrol R
9. Castrol SLX
10. Torco

Here is the link to the full test info:
http://www.performanceoilnews.com/oi...nst_oils.shtml

Here is another test done by pro-street.

Royal purple put out the most power. The avarage baseline of the test car a 350z was 224 hp/220 TQ . with the royal purple it put down a staggering 242 hp 227TQ/!!! Talk about best bang for the buck.

 

i think that 10w30 was being discused your test is for those w40. I have not sent off my oil for testing, and am not an expert. My father is a tribologist and has some insight on oil. He hates royal purple, and you will find many people here who have lost parts using it.
everyone is entilted to their opinon, and what works for one may not for another.

 

i recently picked up motul oil from ds1, never going back to mobil1 again...

 

think with your dipstick jimmy..

 

The Syntec is more than likely a little thicker than Mobile 1. Which is what is helping with your oil loss. It could be you've been a little tender footed lately, who knows. There is a possibilty that the Syntec is more abrasive too. All of these things can, and do come into play when considering your oil loss.

The one thing that I would suggest to those who are having oil loss issues, (that is an issue that is within the 1 qt for every 3000, and your engine seems healthy in all other regards, compression check, leak down, etc...) change out to a dino oil to reseat the rings. Basically, scraping the cylinder walls so that it's not smooth rings against smooth cylinder walls any more. Use it for 3000 miles and then go back to what ever oil you think is the best oil for you. ...or you could just keep adding the oil and go about your marry way, it's up to you.