Marvel Mystery Oil

[Scott Larson]

Sue, in my opinion, no. It is has detergent qualities but it is not harsh, I've never experienced any problems nor would I expect any. I've used Amsoil Engine Cleaner in several engines with only good results also...The "false seals" you're referring to really only show-up in high-mileage, truly dirty engines.

[VX KAT]

Sue, in my opinion, no. It is has detergent qualities but it is not harsh, I've never experienced any problems nor would I expect any. I've used Amsoil Engine Cleaner in several engines with only good results also...The "false seals" you're referring to really only show-up in high-mileage, truly dirty engines.

Thansk Scott.
I used Seafoam once in '09, then used the Amsoil Engine cleaner in 2011
For my VX with 81,400k and about 4,000 miles/year, how frequent should I use these cleaners?

THe MMO sounds so good, I'm thinking of throwing a quart of that in too.

[89Vette]

Sue, in my opinion, no. It is has detergent qualities but it is not harsh, I've never experienced any problems nor would I expect any. I've used Amsoil Engine Cleaner in several engines with only good results also...The "false seals" you're referring to really only show-up in high-mileage, truly dirty engines.

Mechanical backgroud?

Assuming yes...if you buy into the benefit of MMO, what about "Motor Flush"for higher concentrated (oil-change) flushing? Seems like this would be the next level of treatment really hoping to free up engine sludge.

I'm thinking it's mosting Naptha...and you add a whole quart, idle for a few minutes, then dump....and change oil.