Marvel mystery oil. Improved mpg and noticeably runs smoother.
Pros: Improved mpg, runs smoother
Reviews of MAREL parts For Business
Average Rating
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The manufacturer's average rating is calculated based on ratings of all its spare parts. It determines the place in the manufacturer ranking
4.4
Manufacturer Ranking
-
16
Spare Parts
4
Country
Italy
Website
marel.com
Spare Parts
Not sure on the Lucas. Looks little past that. Only marvel mystery oil can help you here. That stiff is magic...
Pros: stiff is magic
I have a 1965 F100. It has been in the family since it rolled off the showroom floor. My wife's grandfather installed a Marvel Mystery Oil inverse oiler. It still works. The truck has 93000 miles and runs great.
Pros: runs great
Vehicle:
Ford
Mileage: 149669 km
Can support the 1/4 cup of MMO in the engine oil. Had a Triton with a tick and adding the MMO made the damn thing run as smooth as a sewing machine
Pros: run as smooth
I had really really bad lifter tick after I fixed the timing on my NA(you can see on my latest post) I put marvel mystery oil in it about 6/8th of a quart after dumping a quart of my oil which was at full before, let it idle for 10 minutes or so by that time the tick was almost fully gone took it out for a 3 minute drive down the street(I have no working radiator fans) went through all gears tick is completely gone only a little during start ups I hear that that’s normal, safe to say I am ready to change my oil back to normal.
Pros: tick almost fully gone
Cons: tick during start ups
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.
Pros: no more valve noise
Vehicle:
Volkswagen Golf
My 89 cabby has over 400 k on it I use some of this stuff every couple of months, a bit in the tank, a bit in the crankcase. Works wonders on the lifter tick helps tired hydraulic lifters, nearly eliminates it.
Pros: eliminates lifter tick
Vehicle:
Volkswagen
Mileage: 400000 km
Marvel mystery oil for a few cycles should help with sludge build up. Just be careful it can be hard on seals.
Pros: help with sludge build
Cons: hard on seals
Vehicle:
Kia
Marvel Mystery Oil, hope, prayers that the mystery comes through. Otherwise seafoam.
Pros: mystery comes through
I have used that Marvelous Mystery Oil crap twice on 2 different cars - within 10 miles, BOTH blew the headgaskets.
Cons: blew the headgaskets
Mileage: 16 km
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Owner reviews of MAREL products
The MAREL brand is registered in Italy. Official website: https://marel.com .
In March 2026, PartReview recorded 16 reviews across 4 parts by MAREL. Average rating — 4.4 out of 5.
MAREL is not yet in the PartReview manufacturers ranking due to insufficient reviews.
Popular MAREL parts
The most popular MAREL products on PartReview:
- Engine oil MAREL - 9 reviews. PR Score — not available yet, average rating — 4.
- Oil additives MAREL - 4 reviews. PR Score — not available yet, average rating — 3.6.
- Hydraulic lifters MAREL - 2 reviews. PR Score — not available yet, average rating — 5.
- Fuel additives MAREL - 1 review. PR Score — not available yet, average rating — 5.
Most owner reviews about MAREL parts are collected on these pages.
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