Synthetic Oil......opinions and testing

Craig 930 RS · 01-14-2007, 06:08 PM

Open discussion, thought I'd toss out a few data points as our 930s are very tough on oil....

Friend is a chemical engineer and does not appreciate the Mobil 1 PR machine. Feels that Redline is the best synthetic oil available:

> redline is expensive and you get what you pay for.
>
> if you look at the HTHS specs (high temperature, high shear)
> nothing compares to redline. this is the best indicator of how
> well an oil can stand up to a high revving turbo engine.
>
> if you look at the flash point, the redline is also higher
> than just about everything else.. this is the temperature
> where the oil vaporizes.
>
> mobil 1's numbers are going downhill and people have
> discovered (from the material data safety sheet) that
> they have started to put in cheaper dino based ingredients
> compared to what their original formula was.. this is
> not information that marketeers can spin.. they have to
> say what the oil comprises of.
>
> there was a huge controversy at the oil geek web site
> over mobil 1.. and mobil has been very evasive
> to inquiries.
>
> also, people have sent used mobil 1 for analysis and
> have found that they don't hold up as well either.
> the M1 0W-40 is pretty bad, it degrades after just
> 5000 miles to a 0W-30 and will no longer be
> adequate for a turbo engine.
>
> let me know if you need more info...

WydRyd · 02:45 AM

*****, that's scarey stuff! I've been using the M1 5W-50 oil in my car. Any thoughts/feedback on that oil?

Loaded · 01-14-2007, 07:47 PM

royal purple is pretty good think

9dreizig · 01-14-2007, 09:40 PM

Craig,, good to know, just curious who makes Redline?? and how many miles do most of you go between oil changes ?? ( assuming a track day or two in there??)

briankeithsmith · 01-15-2007, 04:08 AM

Ok, how many people are gonna leave their oil in the car for 5000 miles anyway???

I do good if my oil stays in the car for 800 miles, much less 5000....
But I've stuck with Kendall....

WERK I · WERK I's Garage

I think Castrol has really stepped to the plate on their Syntec Synthetic and synthetic blends. I used both in my in 930 and Audi Quattro and they have held up remarkably well. Change the oil in the Audi every 2 months and the 930 twice a year.

beepbeep · 01-15-2007, 08:11 AM

Mobil 1 doesn't use PAO as a base for it's synthetic oil in USA, as far as I know. I guess that doesn't make it a synthetic oil anymore.

Anyway, todays oils are much better than oils that were around when theese cars were sold anyway.

I have good expirience with Shell Helix.

rsquad911 · 01-15-2007, 10:33 AM

Motul 300V all the way

Craig 930 RS · 10:47 AM

Brian, I agree the 5,000 mile thing doesn't - and shouldn't apply to us.

I'd still venture to go on a limb and say that Mobil 1 is probably a better choice than a pure natural oil for a 930 that sees hard use. But there appear to be beter choices in synthetics

This is a bit telling, however:
> mobil 1's numbers are going downhill and people have
> discovered (from the material data safety sheet) that
> they have started to put in cheaper dino based ingredients
> compared to what their original formula was.. this is
> not information that marketeers can spin.. they have to
> say what the oil comprises of.

Along with:
> if you look at the HTHS specs (high temperature, high shear)
> nothing compares to redline. this is the best indicator of how
> well an oil can stand up to a high revving turbo engine.
>
> if you look at the flash point, the redline is also higher
> than just about everything else.. this is the temperature
> where the oil vaporizes.

Craig 930 RS · 10:45 AM

Want all the oil reading you can handle?
Check it out - these guys are way into it and appear to know their *****:

http://www.bobistheoilguy.com/

WERK I · WERK I's Garage

http://www.bobistheoilguy.com/

Geez, oil forums. What's next toilet paper forums?

Craig 930 RS · 01-15-2007, 11:16 AM

No doubt. Next thing ya know we'll have lengthy discussions about an intercooler or something.

Craig 930 RS · 01-15-2007, 11:36 AM

Reply from Mobil 1 states they do use the PAO as a base (?)
(I'm not that knowledgeable about the in-depth tech oil stuff.)

The people on the oilguys site are a typical group of internet chatters...kinda like another site we know.
There are a few great ones on there - just takes time....

Me personally? Mobil 1 is fine as far as I can tell. I change it quite often due to frequent track use AND due to the fact that I can only get about 1/2 the oil out per oil change. Lots remains in the 3 oil coolers and lines. Plus I have a chitload of previously purchased M1 in the shop

WERK I · WERK I's Garage

craig,
I hope you realize I was not slamming you or this forum....it is the bobistheoilguy.com oil forum I ws laughing at.

550SPYDER · 01-15-2007, 01:54 PM

switched from Mobile One to Royal Purple XPR 20/50, saw a real world 12 to 15 degree decrease in oil temperature

Craig 930 RS · 01-15-2007, 02:07 PM

How would that be possible?

550SPYDER · 01-15-2007, 02:17 PM

my only guess is that it absorbs heat better and moves it through the coolers quicker. I am running about 15 quarts, 5 of which is still mobile one 5w50. Will be diluted even more when I change oil next week. Running 3 coolers 1 B&B in front, 44Row Mocal in wheel well (two 6 inch fans) and stock engine cooler.

550SPYDER · 01-15-2007, 02:22 PM

Craig, just read your spec sheet. We have the same basic set-up. 3.4, K27, 7.5:1 compresson, 964 cams, B&B Headers. My heads were custom ported (will look up the cut tonight), I have a Koklen intercooler and Monty muffler - no cat

Craig 930 RS · 01-15-2007, 02:32 PM

(Self-hijack)
Cool. Link me to your HP/TQ, I think you posted it somewhere...

sand_man · 11:01 AM

Using Shell Rotella "T" 15W-40 with excellent results in mine. I change my oil VERY frequently! Planning to try Mobil Delvac 1300 Super 15W-40 on my next oil change, this weekend.

edit: ooops, I see you meant for the synthetic oil users to respond. Sorry!