Detail 01
Heavy synthetic formula
It is the #3 heavy valve-oil option.

Independent shopping perspective
JM003 #3 is a 1.6 oz. heavy synthetic valve oil for piston and rotary valves. It is made for valves that already have slightly larger clearance, helping seal them while supporting long-lasting, smooth, fast movement. The formula is also intended to help keep valves from getting stuck, making it a targeted maintenance choice when that larger-clearance condition applies.

Strong match
Consider the trade-offs
What matters in use
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 01
It is the #3 heavy valve-oil option.
Detail 02
The oil is designed for both valve types.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
Yes. It is designed for both piston and rotary valves.
It helps seal valves that already have slightly larger clearance.