I just ran about half a bottle of seafoam in my '01 Z28. I checked the oil color several times...it changed gradually to a dark brown...and when I got close to a hundred and fifty miles (over a three day period) I changed the oil filter (Bosch Pemium) and let out about three quarts of oil/seafoam (synthetic RP) and replaced it with convential oil (Pennzoil High Mileage). I thought this would help supple any seals or rubber internals.I didn't drain out all of the treated synthetic because the oil was really dirty and I want to filter the oil with the new filter and keep cleaning the insides. I figure I'm going to keep watching the dipstick and then change everything again in about three more days. Does that sound like a good plan? My Z28 has over a 100K miles on it, but it runs strong and fast. Will I hurt the motor by leaving the diluted seafoam in a little while longer 'cause I think it needs a little more cleaning before I rinse fully.

