Problems with Direct Fuel Injection Engines
http://www.6speedonline.com/forums/9...ine-issue.html
I wonder if we will be ok since we have both direct and port injection, the latter will clean out the gunk????
From my experience with my IS350 I doubt this is a big issue because we have both DI and PI. I've long wondered why the 4GR-FE in the IS250 had issues with oil fuel dilution, and this discussion seems to go straight for the throat about dilution and carbon deposits. I almost wish I still had my 350 so I could pull off the intake and look for build up - it had almost 60k on it when I traded it in. Regardless, I did sufficient oil analysis on the 350 to determine there was no significant oil dilution from fuel even with 10k mile oil changes. My F is coming up quickly on the 5k oil change and I'll be pulling a sample to send to Blackstone just before I take it in for the free oil change. So, I'll have a clear picture of what is happening with the engine. I'll also be changing to Mobil 1 5w-30, so I'll build up a database of information about my particular engine as it wears.
In the end, thanks for the link to this discussion. There's also a link to BITOG with even more information. Great stuff!
Last edited by lobuxracer; Apr 9, 2009 at 07:40 PM.
From my experience with my IS350 I doubt this is a big issue because we have both DI and PI. I've long wondered why the 4GR-FE in the IS250 had issues with oil fuel dilution, and this discussion seems to go straight for the throat about dilution and carbon deposits. I almost wish I still had my 350 so I could pull off the intake and look for build up - it had almost 60k on it when I traded it in. Regardless, I did sufficient oil analysis on the 350 to determine there was no significant oil dilution from fuel even with 10k mile oil changes. My F is coming up quickly on the 5k oil change and I'll be pulling a sample to send to Blackstone just before I take it in for the free oil change. So, I'll have a clear picture of what is happening with the engine. I'll also be changing to Mobil 1 5w-30, so I'll build up a database of information about my particular engine as it wears.
In the end, thanks for the link to this discussion. There's also a link to BITOG with even more information. Great stuff!








