Hi,tclederman! Happy New-Year!! My truck (as you probably know),is a '55-2nd-Series 6500. The engine is a 261,and I was COMPLETELY baffled,when I inspected the truck before I bought it. No sign of an oil-filter! I brought a friend out,to take a look,and he was really impressed! He said that I have an "industrial" Chevy engine,usually found on fire-trucks,(which it was),of that era. They were called Self-Cleaning-Oil,or S.C.O.'s. He explained that the engine-oil is channeled through the oil-bath air cleaner,then siphoned back into the block,through vacuum. not quite sure how it works,but it works!! In the "Gallery",Jeff Bradshaw HAD a "55 Task-Force G.M.C. 450,with a 302 S.C.O.,and it WAS a County Maintenance truck. Un-fortunately for Jeff,the truck WAS equipped with a "Micro-lock" brake switch,and he didn't know those things can "Bleed-out",after a time-span.Pic's are worth a thousand words. I change my oil every 1,000-miles,just to be safe. She has between 35-40 P.S.I. when warmed-up,and doesn't use ANY oil. Hope this helps.
Last edited by wetwilly5757; 01/07/2013 9:49 PM.
