Seafoam in the oil
 

how long should seafoam be left in the oil before you change it? I got 120k on the clock should I have any issues adding this to my oil?

Just use transmission fluid, I don't like putting seafoam in the crankcase.

Transmission fluid is like tide for your engine, you can replace 1 quart of oil with transmission fluid and run it for the whole oil change.

never heard of this

I know some people will disagree and say it does nothing but I do it all the time with good results.

It's popular among backyard mechanics and where I live.

At my old job for an example we had a silveardo with a 5.3 that was completely sludged up from lack of care. Changed the oil and half of it was transmission fluid and ran it for 20-30min. It cut down tons of the sludge and it came pouring out in black chuncks when we changed it again.

I usually put seafoam in for about the last 150-250 miles before I change my oil and it does a good job for.me like that

The detergents in the trans fluid will clean the engine from the inside.

It does work as stated. Replace 1 Quart of oil with 1 quart of trans fluid. Just don't beat the motor too hard as it is dislodging some of the build up which can block small passages like pushrods and lifter bleed holes.

You can also use Marvel Mystery Oil.

I was over the Sea foam after it doubled in Price. It's in the $10-$11 range at most Auto parts stores but it's just over $6 at Walmart. I prefer to use their engine tech house brand oil and transmission fluid when flushing motor's.