In Reply to: Re: Stuck Valve Or Worse posted by 8n13325 on July 23, 2020 at 21:49:35:
The old timers had many of their own 'cure-all' myths for engines. My late Uncle Bernie told me to use STP Oil Treatment in their (now mine) early 9N for improved engine life. Even today, many 'snake-oil' products are sold and the consumer who doesn't do his homework will believe and buy anything. There is no 'Mystery' to MMO and many other products. The main ingredient is plain mineral spirits, a very effective thinner and cleaner.
74% -Mineral Oil
25% -Stoddard Solvent*
*Stoddard Solvent is defined as Mineral Spirits, for one.
You'd be better off buying a can of mineral spirits at NAPA or paint thinner or plain charcoal lighter fluid -it's all the same. You can for a list of product MSDS sheets on our SAFETY forum to see for yourself.