DO NOT USE Marvel Mystery Oil with any brand of synthetic or regular oil!!! The additive package
in today's oils,especailly in synthetic oil, is More than adaquate to keep any engine as clean and
friction free as possible. Adding MMO to the oil crankcase most likely will upset the chemical balance
in these additive packages in most motor oils and is not necessary, unless you want to clean an
old engine that has a lot of sludge/varnish build up due to neglect. The reason why MMO recommends
their product to be put in engine oil is because it USED TO be needed years ago when engine oil
was much more crude, i.e. less refined, and additive packages were no where near what they are today.

However, as a frequent user of this stuff, it IS GREAT as a fuel cleaner/upper cylinder lube! About 4oz.
of MMO in the gas tank does WONDERS for my Nissan Sentra, of which is my only vehicle and I neeed
to be dependable. Cleans out the crud that most unleadded gas puts into an engine and lubes
the upper cylinders. My tach needle has never been happier!!!

Hope this helps,
Xeno