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Message: <blockquote data-quote="stutaeng" data-source="post: 27625" data-attributes="member: 6175">I put a cheap Amazon catch can on my 06 Suburban LQ4 after I dropped in after doing a DIY freshen up rebuild...the intake was pretty grimy when I was cleaning up the parts for reassembly. I should have also upgraded to the updated valve covers, but I didn't. Seems to be working well: there are a few ounces of oil in it every few thousand miles.The L59 I swapped into my 99 Silverado runs with nothing extra. I removed the intake once and there was a bit of blonde oil on the intake runners, but wasn't horrible.Neither of those engines have EGR. I deleted that on the 99. EGR was only on the earlier years GMT800s, GM deleted it at some point.Now EGR on the previous generation SBC is a really gross job. The EGR dumps carbon and makes a huge mess. Those have that goofy spider injection system so the injectors live inside that upper plenum, under heat, carbon deposits and gas vapors, and exhaust soot thanks to the EGR. The FPR also lives under there and they commonly leak, dumping fuel and causing the engine to run extremely rich and the ECU goes bananas trying to dial back fuel. Seen that numerous times. In my opinion, that's one of GM's worst designs ever. Horrendous. I hate that system!</blockquote>