I filled up my car the other day and noticed the diesel was a light green. I thought it was to be clear like water. Am I missing something?

The new ULSD (Ultra Low Sulfur Diesel) is light green and more watery (lower viscosity) than the old stuff, hasn't affected mine yet AFAIK.

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1982 300DT 190K (Diesel Purge + synthetic oil=smoothness at last!!!)
2004 Ford E-350 6.0 L PSD 227K
2006 Dodge Ram 3500 SRW HO Cummins 4X4 48RE 42K (brute force tow vehicle)
2005 Scion xB wife's rolling pop can
1993 GMC Sierra C3500 6.2 142K

My cars had clear, blue, green, red (don't tell anyone!), and now yellow biodiesel... And I've only had it less than a year.

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Ich liebe meine Autos!

1991 Mercedes-Benz 560SEL | Megasquirt MS3-Pro | 722.6 transmission w/ AMG paddles | Feind Motorsports Sway Bar | Stinger VIP Radar | AntiLaser Priority | PLX Wideband O2 | 150A Alternator | Cat Delete
1981 Mercedes-Benz 300SD | Blown engine, rebuilding someday...
1981 Mercedes-Benz 300SD | Rear ended, retired in garage.
2009 Yamaha AR230HO | Das Boot

Excessive speeding? It ain't excessive till I redline!

Depends on the light you are viewing it, how thick the stream is and what type it is. It can be clear, green, blue, purple or yellow.

yellow and green is what ive seen on good quality diesel. The bunk diesel my mom ran in her TDI was dark blue, it caused the car to smoke alot and run like crap.

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Current:
05 E320 CDI
07 GL320 CDI
08 Sprinter
05 Dodge Cummins
01 Dodge Cummins

Previous
2004 E55 AMG
2002 C32 AMG (#2)
1995 E300
1978 300D
1987 300D
2002 C32 AMG(blown motor :[
1981 300SD
1983 300SD
1987 300SDL
2002 Jetta TDI
1996 S420
1995 S500
1993 190E 2.6
1992 190E 2.3
1985 190E 2.3 5-Speed

premium D is clear , green is highway taxed , red is off road taxed ,,, red can also be low sulfer heating oil .. never seen yellow, except in OLD fuel ,, nor blue or purple ,, ( at least here in Mich )