Are there any full synthetic oils are out there that can replace repsol synthetic 10w-50? I have been running these on my dirt bike and ATVs for years now. The price has steadily increased over the years and I have added more toys…. My Yamaha rhino was using this oil as well but since last year I have switched to Rotella synthetic (the same one that I use in my truck!) , works just fine.
Any thoughts?

 

Rotella T6 is exactly what I use in bikes. Note on the jug that it is JASO MA, meaning it is rated for Japanese motorcycles.

 

Awesome, I'm switching over as well...Repsol is just expensive.

 

I just noticed this thread.

Not sure if this stuff is available in your area, but I run Mystik JT-4 ATV Oil in both my Polaris Scrambler and the wife's Kawasaki. I use the 0W-40, but it also comes in 10W-40. Previously I had been using either Amsoil or the Polaris stuff from the dealer, both of which are $10 a quart. I can get this Mystik oil for $5.49 a quart at a local store.

Mystik Store - Mystik®JT-4® Synthetic 4-Cycle ATV/UTV SAE 0W-40 - Product Details

 

Yep. Rotella T6 for me as well.