bob duffer Posted August 28, 2014 Share Posted August 28, 2014 Does anyone use Marvel Mystery oil in there engines? (In the gas or oil ) Is it good to use or a waste of money?Will it harm our Thunderbird engines? Link to comment Share on other sites More sharing options...
Guest 55ENJOYTHERIDE Posted August 28, 2014 Share Posted August 28, 2014 (edited) I use the Shell Rotella T 15W-40 oil in my 55 since I read these articles written by an expert.Not expensive too at $30 for 5 liters.https://www.ctci.org/gilsgarage/EngineOil.phphttps://www.ctci.org/gilsgarage/EngineOil2.php Edited August 28, 2014 by 55ENJOYTHERIDE (see edit history) Link to comment Share on other sites More sharing options...
JFranklin Posted August 30, 2014 Share Posted August 30, 2014 (edited) MMM is good stuff! Use it or not, it is your choice. I use it. Edited August 30, 2014 by JFranklin Punctuation (see edit history) Link to comment Share on other sites More sharing options...
1957Birdman Posted August 31, 2014 Share Posted August 31, 2014 Hi Bob,Using MMM won't hurt, but using Shell Rotella or a similar brand formulated for diesel engines is the best way to go.Regards,Lew Link to comment Share on other sites More sharing options...
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