LS1TRUCKGUY

iTrader: (7)

i know that some detergents are not recommended in high mileage engines, but should it be ok to run a bottle of seafoam in the oil for a couple of minutes before the oil change to flush it out? i run 15w40 royal purple in it if that makes a difference. its a 5.3L with 100,000 miles on it. what would you guys recommend?

TravisH

iTrader: (1)

I wouldnt seafoam the crankcase on a higher miles motor. It could start smoking. You can run it through your gas tank so it cleans out your fuel system and combustion chamber, but I woulnd want it in the bottom end.

LS1TRUCKGUY

iTrader: (7)

thats all i needed to know. thanks 99black.

moregrip

iTrader: (8)

here's a good read:

https://www.performancetrucks.net/fo...hlight=seafoam

budhayes3

iTrader: (19)

I'm not a fan of adding anything to the oil, especially detergents. Personally, I just stick with normal oil change intervals and good old Mobil1 synthetic (been using 10w-30). Seafoam is great for cleaning out the induction system (intake, combustion chambers, valves), but that's as far as I go with it. (well, a little bit in the gas tank is OK too IMO)

mason110

I have done this before, didnt hurt it at all. I just addded a little to the crankcase drove to the store and back and changed my oil. Dunno nothing bad happened to me and its been mad long since i did that.

RoninsDenali

iTrader: (1)

I'll throw a bottle of Seafoam in the crankcase just before i change the oil every once an and a while. And to be honest, my last oil (appearance wise) lasted a lot longer. After 3000 miles it still was golden amber. I just attributed that to the Seafoam helping to get all that extra crap out.

1ImperialSS

iTrader: (5)

i usually dont put any in the oil an i have 80k in mine stick with the brake booster line and a little in the tank

LS1TRUCKGUY

iTrader: (7)

im guessin it will clean the vacuum system out by putting it in the brake booster line? what about the pcv system?

1ImperialSS

iTrader: (5)

the brake booster line feeds all the cylinders like the PCV, it will clean carbon build up throughout the innards and combustion chamber and stuff