I hadn't really paid much attention to this until recently, but I just noticed I have two sets of credits. I tried to look this up in the search, but came up with nothing. I have completed all the races in career mode. When I go back and race events I've already won, I accumulate more credits (as would be expected). I've currently got 13mil credits, or something like that. HOWEVER, when I go to my garage and buy parts/mods, I see a different set of credits decrease. I have 5mil credits that I spend from, yet winning races doesn't replenish this. My assumption is, those credits I'm spending, were won from events the FIRST time they were completed. Rewinning them does not add credits to the "spendable" pile. What is bothering me, is if my theory is correct, then I have a finite amount of credits to spend, and I can never get more. Meaning, I can't modifiy ALL my cars like I want! Is this true, or am I missing something?