I use to use Mobil 1 15w-50 (car oil) in my race bike...... I'll probably end up using Mobil 1 MX4T in my street bike. Walmart Sells Mobil 1 MX4T 10w-40 so that makes it a bit more convienient.....
Engineered for on-road, off-road and competition four-cycle motorcycles. Key benefits of Mobil 1® MX4T 10W-40:
Helps provide optimum acceleration and peak horsepower.
Scientifically developed high-performance additive system.
Provides excellent engine protection at peak rpm.
Superb transmission protection.