Building a fleet-Part 6-Tank cars

I need some tank cars for my consists. There were some oil dealers along the district : at least two in Hemet and  one in San Jacinto, and probably some in Perris. Photos evidences shows one or two tank in typical consist of the days, so... S scale is blessed with a nice selection of classic tank cars (thanks to the NASG brass comitee/Overland, WA Drake, Southwind...), curiously as so many lack in some categories...
Like too many of my freight cars, the story began quite a long time ago. Maybe this former SP tank was decalled as Sinclair (CDS transfer) in 2005/2006 and very lightly wheathered. I've also changed the original trucks as mine didn't tracked well with some from American Models. In 2015, it was re-wheathered a bit and I finished it only this week-end. Black is a very difficult color to wheather (light colors like yellow are generaly easier) and it was the case here. I've spent the time of two or three boxcars wheathering on this one only!
I don't have that much photos of real wheathered tank cars in colors so It was a process of trial and errors, mixing acrylic (black), oils (black, raw umber), and enamels paints (AK fuel stains 025, shafts and bearings grease 7012) for the dome and oil traces only. I hope there was a Sinclair dealer along the line to justify the efforts! The next tank will be a yellow Shell 10000 gal tanker with custom decals. I hope it will be easier to do...
See ya'