12 votes
I swapped a motor into my golf yesterday fired it this motor hasn't ran in like 4 years. Right away the valves were clack a lacking like crazy even after running for 15 minutes and pumping up there was still one or two of them were quite loud. Added a half quart of mmo amazing no more noise.
Just used it on an 83 4runner I picked up through a tow-yard lien sale. There was a pretty loud lifter knock and now it's down to a slightly annoying whisper.
I've got just under 200k miles on my 12v VR6 and I use MMO at every oil change. I've been running 4 3/4 quarts of synthetic oil and 1/4 quart of MMO at EVERY oil change for almost 100k miles and the thing runs like a top.
I have used that Marvelous Mystery Oil crap twice on 2 different cars - within 10 miles, BOTH blew the headgaskets.
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The brand is registered in Italy. Official website: https://marel.com.
In March 2026, PartReview does not yet have a formed opinion of MAREL oil additives. You can help by adding a review for MAREL oil additives.
Currently there are 4 reviews and 12 votes. Average rating — 3.6 out of 5. Vote balance: 9 up, 3 down.
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