RKA

M1 0W40 reportedly shears down to a 30W oil anyway. If you want something a little thicker for the summer, the delvac 5W40 might be the ticket (though I haven't seen it on a shelf yet).

ryans4

...you'll need to find a truck stop. The Delvac 5w40 is for deisal's, so most normal places won't carry it.

Or if you can find a Mobil 1 distribution location, they'll have it. It's sold by the gallon I believe.

As to FixedWing's comments, with the oil cooler, I dropped down about 50F in normal driving. With the addition of the Castrol TWS 10w60, I was rocking solid in the NorCal summer, normal temps were 200, max was a hair under 250. With the Redline 5w30 and NO oil cooler, normal temps were 250, and I went north of 300 on track.

The GC 0w30 should be good for performance, and I'm hoping with the Oil Cooler it'll keep me around 225 normal and <275 on track, but we'll have to wait till April to see. If I go north of 275 with the oil cooler and GC 0w30, it won't go back in the car.

And after running the 10w60 in both winter and summer (NorCal/Las Vegas winter, not snow type winters), I think the "perfect" oil for me may be a 5w40 full synthetic.

Who knows though, maybe the GC 0w30 and the Oil Cooler will get the job done.

FixedWing

But there still is a difference.

Viscosity, ASTM D 445 for Mobil One 0W-40 is 14.3 cSt @ 100º C. For German Castrol it is 12.1.

http://www.mobil.com/USA-English/Lubes/PDS/GLXXENPVLMOMobil1_0W-40.asp

http://www.castrol.com/liveassets/bp_internet/castrol/castrol_usa/STAGING/local_assets/downloads/p,q/pds_syntec_usa.pdf

Stephen

Blown Nogaro

Then one day they started making noise, so I now have K04's.

Silver Streakin'

my oil samples come back with good results using M1 0w40 in my 1.8T

GrandPaJohn

Any difference? You may not notice it in the cold weather, I heard more of a difference in the summer. Also, a few of the guys on the oil forum chipped in the have this stuff analyzed. Some feel it's a true Group 4 synthetic. Results aren't in yet. Here's what there doing:


"Zoil test protocal over view. Second run is still ongoing and the interpretative difficulty level has been high because the cataloged data on fully formulated lubes is NIL and what exists is held close to the vest.


From the first mass spec run :


Z-oil Investigation, Preliminary Report


All samples were diluted 1:100 by dissolving 0.5 mL of each into 50 mL of dichloromethane (CH2Cl2) and stored tightly capped at room temperature until analysis by gas chromatographic mass spectrometry. A Hewlett-Packard 5890 Series II gas chromatograph with a model 5971 mass selective detector was used to characterize the five liquids. The gas chromatograph was equipped with a 60 m long, 0.25 mm i.d, 0.25 µm film thickness Rtx-5MS (5% diphenyl-95% polydimethyl siloxane) column manufactured by Restek Corporation. Ultra-high purity helium gas was forced through the column at 0.86 mL/min. The temperature profile for these analyses was:

Hold 4 minutes at 150 °C, ramp the temperature at 5 °C per minute until a final temperature of 310 °C is reached. Hold at 310 °C for 15 minutes. The total run time for each analysis was 51.00 minutes. The inlet and mass spectrometer transfer line were held at 300 °C at all times during the analysis.

One µL of each solution was manually injected into the chromatograph using a splitless injection. 0.75 minutes after injection, the injector purge gas was turned back on. The mass spectrometer has an 70 eV electron impact source, and it was instructed to scan from 50 to 500 Da every ~0.01 minute starting 4 minutes after injection.

All chromatograms were background subtracted by integrating a portion of the data from the very end of the analysis and subtracting the resulting mass spectrum from every scan in the rest of the dataset. This was to minimize the influence of stationary phase bleeding off of the column (particularly the to limit the occurrence of a large ion at m/z 207) on the analyte mass spectra. The resulting chromatograms were integrated by hand."

Don't ask me what that all means :-O

RKA

Bought the car used, and it's remained pretty consistent across that 25K miles. Time will tell (obviously), but I'm not swapping turbos based on the siren song.

lemieux@curbside

in the really hot areas i'd even go 15-50 ..i will this summer.

Blown Nogaro

I know of one owner who had the siren noise for 50K miles and he just got tired of it, so he went stage 3. Mine was very loud and the boost was building more slowly. They didn't completely blow up but they were like a time bomb, so I just swaped them out with K04's.

RKA

What's the difference? We don't have anything more accurate to go on other than the posts on the oil forums. So far the indication is that the M1 starts off as a 40 weight but shears down quickly.