according to 993tt.com the cleaner will end up mixing with the oil so recommended to do prior to doing an oil change
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1988 930
Black on Tan, Fikse Classic Mach V, twin plug too much to list
1996 993TT
Horizon Blue Metallic, champion monolites, Ruf Body kit, UMW POWERED!!
2008 RS4
Avus Silver titanium package, smoked wheels and tips, K&N Filter, Milltek non-resonated exhaust, Revo Tune
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