Too clean for seafoam effect?
I also found no difference in oil condition from that of previous oil changes. I have had the car since it had 44k miles on it and I have always used RP Oil and Filters. Is it possible that my engine is that clean that there was nothing to clean out?
Would there be any downside to trying again(other than possibly wasting $8)? If I skip the crankcase and just do the vacuum tube part then I dont have to change the oil, correct?
Thank you

I then tried it on the old work van just to make sure I did it right.
This van is a 89 GMC conversion van thet we use to haul stuff and it gets allot of abuse.
It smoked so bad that we could not see 3 feet away because of all the smoke.
I also found no difference in oil condition from that of previous oil changes. I have had the car since it had 44k miles on it and I have always used RP Oil and Filters. Is it possible that my engine is that clean that there was nothing to clean out?
Would there be any downside to trying again(other than possibly wasting $8)? If I skip the crankcase and just do the vacuum tube part then I dont have to change the oil, correct?
Thank you
Many many people who know a lot more than me about cars and who have been doing this a long time do recommend the SeaFoam thing if its indicated. Do a search, might change your opinion.
If you always use premium fuel, and/or techron it once in a while and you are lucky enough to have zero carbon buildup, then yeah, it would be a waste.
But you cant be saying that no c5 has any carbon build up?
I always use top tier fuel, and I techron once in a while but when I took my car for a street tune (ECS) they told me it probably has some carbon build up. I bought it used so no telling what the previous owner put in it.
Im waiting for my oil change to do the SeaFoam, plugs and wires.
OP: if you are just adding it through the vacuum line, the manufacturer doesnt say you have to change the oil.
Some cars get deposits, if you have them you probably should do something about it (not that its gonna kill anything) but why not?
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