Were switching at work from Delo 400 to Scaeffers 15-40. Needless to say all I need to buy is a filter but info is scarce. I'm told its good stuff and that it's parifin based with a high detergent content, but then it was said that parifin base is bad resulting in high build up (the same as Pennzoil and Quakerstate which are Pennsilvania crude, that I was always told was superior because of a longer molecular chain. ) So which is it, go to Costco for the Delo or use the Scaeffers?
Last edited: