| Re: Is Marvel Mystery Oil ok for valves? Marvel Mystery Oil makes a machine oil that is sold in 12oz bottles and is available most hardware or auto parts stores. I've used this product for several years on my 3rd and 1st slides. It is the perfect consistency and works better than anything else I've used. I put it in an old valve oil bottle and a couple of drops on each slide is all it takes. Most slide greases make the slides too stiff unless thined by valve oil. The only draw back, it is red just like that which is for the crankcase so you have to be careful not to get any on light colored clothing.
It is too heavy however for valves!!!
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