Mikey, you should be able to find Mobil 1 15W-50 at any Walmart or NAPA auto parts store. Mobil 1 is now being sold in 1 gal. jugs along with the familar quarts.
1994 MB E320 Coupe (199,500 mi)
1992 MB 190E 2.6 (173,000 mi)
1983 Porsche 911SC (148,000 mi)
2004 Volvo V70 2.5T (198,000 mi)
President of CT/Westchester Section