Rated 4.6 out of 5 by 38
Rated 5 out of 5 by Chev Great Product!
This product works fast. The engine always hesitated once the Marvel Mystery was added this product seemed to work really well. So far have experienced no more sputtering of engine. Thanks Pep Boys!!!
October 10, 2015
Rated 1 out of 5 by et2003 can't see it did any good at all
did not get what i expected
September 22, 2015
Rated 5 out of 5 by Bayoya Verry good product
Good not only for 4 astroke eng. but also 2 strokes
August 28, 2015
Rated 5 out of 5
by CharlieG Marvel Mystery Oil
Wonderful all year product
August 22, 2015
Rated 5 out of 5 by Bethlehem Marvel Mystery Oil and Fuel Additive
I have used this product for over 30 years- been around as long as dirt- great dependable product.
September 2, 2015
Rated 5 out of 5 by fdesmond Great stuff I always Use
I get better mileage using this product
August 31, 2015
Rated 5 out of 5 by MissThang1 Product was fabulous, does what it advertises!
Easy to put in clear instructions as to what to do. My engine is Happy now.
August 9, 2015
Rated 5 out of 5 by Bentknight Always used it and always will!
I have used this in my cars and motorcycles for years.
If you ever wondered why Diesel engines last so long, this is why. Diesel fuel is essentially an "Oil". It lubricates the upper cylinders and valves/injectors etc...
Add a little to your fuel tank at fill up and listed to how quiet your engine gets and how smooth it feels.
Get it on sale with the 30-35% coupons!
July 17, 2015