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2017 Lexus GS350, 3.5L V6, Factory Fill, 873 miles #4458514
07/13/17 05:09 PM
07/13/17 05:09 PM
Joined: Apr 2004
Posts: 762
Herndon, VA
btanchors Offline OP
btanchors  Offline OP
Joined: Apr 2004
Posts: 762
Herndon, VA
Factory fill that I dumped early from my new GS-350. Happy to see no fuel dilution on this Direct-Injection engine. However, viscosity is pretty low even for a 0W-20. I re-filled with *gasp* Mobil 1 0W-20 Annual Protection.


Re: 2017 Lexus GS350, 3.5L V6, Factory Fill, 873 miles [Re: btanchors] #4458551
07/13/17 05:56 PM
07/13/17 05:56 PM
Joined: Apr 2012
Posts: 9,352
Kendall, FL
wemay Offline
wemay  Offline
Joined: Apr 2012
Posts: 9,352
Kendall, FL
With only 853 miles on the oil, you won't see dilution. Very nice car. Congrats.


'18 KIA Sportage 2.4L LX AWD: GTX Magnatec 5w20
'13 Hyundai Santa Fe Sport 2.0T: EDGE 5w30
Re: 2017 Lexus GS350, 3.5L V6, Factory Fill, 873 miles [Re: btanchors] #4458561
07/13/17 06:09 PM
07/13/17 06:09 PM
Joined: Oct 2010
Posts: 1,779
.
Danh Offline
Danh  Offline
Joined: Oct 2010
Posts: 1,779
.
This is Blackstone, so any data on fuel dilution is suspect. With viscosity nearly out-of-grade after 800 miles it seems very likely a fair amount of fuel dilution is present. Notorious diluters like Honda and Hyundai get to 6.0 or 6.2, but only after 5k + miles.

Re: 2017 Lexus GS350, 3.5L V6, Factory Fill, 873 miles [Re: Danh] #4458577
07/13/17 06:22 PM
07/13/17 06:22 PM
Joined: Apr 2004
Posts: 762
Herndon, VA
btanchors Offline OP
btanchors  Offline OP
Joined: Apr 2004
Posts: 762
Herndon, VA
Does fuel that makes its way into the oil "evaporate"? I would think gas in oil would tend to evaporate if the oil reaches operating temperature and stays there for awhile.

Re: 2017 Lexus GS350, 3.5L V6, Factory Fill, 873 miles [Re: Danh] #4458599
07/13/17 06:40 PM
07/13/17 06:40 PM
Joined: Dec 2005
Posts: 9,860
Upper Midwest
kschachn Offline
kschachn  Offline
Joined: Dec 2005
Posts: 9,860
Upper Midwest
...


1994 BMW 530i, 228K
1996 Honda Accord, 263K
1999 Toyota Sienna, 400K
2000 Toyota ECHO, 271K
Re: 2017 Lexus GS350, 3.5L V6, Factory Fill, 873 miles [Re: btanchors] #4458626
07/13/17 07:12 PM
07/13/17 07:12 PM
Joined: Sep 2015
Posts: 2,256
Malaysia
zeng Offline
zeng  Offline
Joined: Sep 2015
Posts: 2,256
Malaysia
This rather high viscosity drop in merely 873 miles is 'solely' due to shear-thinning of high VII FF oil.
Flash temperature of 420F does not reflect fuel dilution in this GDI engine, IMHO.
One might be seeing clear indications of fuel dilution after say, 8730 miles.

Last edited by zeng; 07/13/17 07:14 PM.
Re: 2017 Lexus GS350, 3.5L V6, Factory Fill, 873 miles [Re: btanchors] #4458685
07/13/17 08:04 PM
07/13/17 08:04 PM
Joined: Oct 2010
Posts: 1,779
.
Danh Offline
Danh  Offline
Joined: Oct 2010
Posts: 1,779
.
Originally Posted By: btanchors
Does fuel that makes its way into the oil "evaporate"? I would think gas in oil would tend to evaporate if the oil reaches operating temperature and stays there for awhile.


Gasoline is not homogenous but rather has a large number of components, both heavy and light, each of which has their own evaporation point, some of which are quite high. At typical oil operating temperatures, only about half of gasoline that enters the oil will evaporate. So, once gasoline enters the sump, some of it will remain under any circumstance.


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