Motorcycle Maintenance and Oil Information for 2004 Beta Jonathan 350 350
An engine-oil service on the 2004 Beta Jonathan 350 350 calls for more than a product match. Identify the correct oil requirement for this particular motorcycle, then follow the prescribed drain, refill, and final level-check steps.
What kind of engine oil does a 2004 Beta Jonathan 350 350 need?
In the product lookup for this model, 10W-50, 10W-40 are the engine-oil grades shown. The matching oil selection includes 10W-50 Synthetic Dirt Bike Oil, 10W-40 Synthetic Dirt Bike Oil. Check the owner’s manual for any additional oil requirements beyond the listed viscosity.

