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MG MGA - Random Info Marvel's Mystery Oil

I've often heard that MMO is good in dashpots. I sent a note to MMO to inquire about the weight of the oil.

I just got a note back indicating that it is 5 weight oil.

Thanks,

Tysen
T McCarthy

Thanks for sharing the information as I use MMO in my dashpots. I wonder what the weight of the dashpot oil is that Moss sells. Obviously a heavier weight. -M.S.
Martin Straka

Totally unrelated to MGs but more uses for MMO. When I was crop dusting (with Stearman Airplanes) many years ago, and when putting the airplane away for the winter months, I would draw MMO into the engine to help preserve it while idle for several months. This was done through the carb. while engine was running to insure the valves got coated too. I have also sprayed MMO into my MG engines (through the spark plug holes) for the same reason when storing them for long periods of time. Cylinders and valves always remained clear of rust etc.
Joe Wiley

Martin,

One item for your consideration is that a 5 weight oil in the dashpots would make for a very lean acceleration.

At some point this summer I am going to try

MMO
ATF
20 weight

and

30 weight

to see what they do to the mixture during acceleration as indicated by my colortune.
T McCarthy

I've traditionally used AFT in the dashpots. Traditionally = 26 years of having my A on the roads! If you do a review of the different options, please share as I would be curious to see the outcome.//nk
N Kopernik

I use Penrite dashpot oil in my SUs with the exception of my Supercharged ZA Magnette where I use the heavier weight oil that Moss supplies to increase the damping of the piston.
I do use MMO in the blown car, I have a vintage upper cylinder oiler installed and that is filled with Marvel. Does it work? Not sure, but it sure looks the part! (See pic)

Cheers,
Rich[img]http://www.fototime.com/E06D76C22003A49/standard.jpg[/img]

Rich McKIe

Well, that didn't work...How about this
http://www.fototime.com/E06D76C22003A49/standard.jpg
Rich McKIe

And just how are you going to monitor the colourtune whilst accelerating??? No-load conditions will not tell you anything meaningful. If you have access to a chassis dyno (rolling road), you would have better indications from that equipment than from the colourtune, so you can't mean that... Please tell me that your wife will not be strapped to the bonnet ;-) Perhaps a G-force meter would help?
David "puzzled look on face" Lieb
David Lieb

David,

Fortunately I'm a salesman so I get less caught up in the details of precision than my engineering bretheren.

;-)

I planned on simply noting the comparative changes in color while pulling up on the accellerator cable and watching the electronic tach.

I'll prolly also go to a repair shop and borrow their O2 sensor.

I don't plan on making any particular changes to the system, really more of an observational experiment.
T McCarthy

I have used 3 in 1 oil since the mid sixties, please don't tell me I've been using the wrong oil for 40 years!
It has always run well, I've never bothered to try different oils for comparison. Now I'll have to experiment!
GrandPaFuzz
Russ Carnes

I use 3 in 1 oil (SAE 20). This oil dampers the pistons just fine. It's easy to dispense out of the can. Don't fart around with anything else.
Arthur DiLello

This thread was discussed between 26/06/2008 and 14/07/2008

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