ooops, yeah, always.

but keep in mind, i am in ca as well, famous for bad gas and only 91. that's why in the beginning i said i don't know if it's normal or not. but at least over my last few cars it's been very consistent. and doesn't seem to be brand / engine specific since even my m3 is like that.

in the beginning it was a bit frustrating coz' i would be polishing the exhaust tips for 30 mins on a sunday, but by the coming weekend, the tips are dark again.

now, i just forget it, hehe.... especially the m3, i care more about driving it

 

You change the fuel use Super

Tell me the results of the

 

True...high-sulfur levels in gasoline increases carbon emissions.

One of the reasons why the EPA Clean Air Act was enacted in the USA.

USA was already phasing the lowering of Sulfur levels in BOTH gasoline, and diesel for more than 2 decades now.
By 2004, all USA gasoline will meet a corporate average of 120 ppm (max cap level at 300 ppm). By 2006, sulfur levels in gasoline will average 30 ppm (max cap level at 80 ppm).....This is in contrast with Europe's average sulfur level cap average of 50ppm by 2005.

California is probably the leader in Low Sulfur gasoline/diesel levels in the USA.


**Sulfur levels was actually mentioned by Lexus Corporate to me as one of the exaccerbating reasons for carbonization; they mentioned that they first noted the carbonization issues in states outside of California (reason stated previously).

**Lexus' TSIB Fix for the Carbon Buildup issue ( L-SB-0087-08 ; L-SB-0030-10) is tangible proof that a technical upgrade in design is necessary to mitigate their KNOWN carbon buildup issue-which is BEYOND using High Grade/Low Sulfur gasoline to prevent carbonization.

BTW, notice the growing trend of issues coming out in other Lexus models regarding carbon buildup