Where can i get Mobil Delvac 1 in houston? i also need a good oil change pump any suggestions?

id rather not turn this into an oil debate, just need to know where to get the stuff, thanks.

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1991 300 D 2.5 Turbo, 220k
also in the family:
1981 240 D 185k
1991 350 SD 185k
2006 S 500
2005 SLK 350