Maxima Primary Oil - V-Twin OIL 32oz

Maxima primary oil is a mineral-based V-twin gear oil formulated for wet primary chain cases and diaphragm spring clutches in Harley-Davidson and Indian Motorcycle engines. Shear-stable formula reduces chain and gear wear while ensuring smooth clutch engagement and positive shifts.

Features

• Mineral-based V-twin gear oil
• Formulated for wet primary chain cases and diaphragm spring clutches
• Shear-stable to minimize chain and gear wear
• Reduces clutch slippage and ensures smooth shifts
• Extends primary chain life

Specifications

• Brand: Maxima
• Manufacturer Part #: 40-04901
• UPC: 851211003300
• Size: 32 oz
• Weight: 2.01 lbs

Fitment

Fits Harley-Davidson models 1984 and newer with wet diaphragm spring clutches. Also suitable for other V-twin motorcycles including Indian.

Frequently Asked Questions

Will this work in my Harley primary case?

Yes — formulated for all 1984 and newer Harley-Davidson models with wet diaphragm spring clutches. Indian V-twin owners can also use this product.

How often should I change primary oil?

Check your owner's manual, but typically every 1,000–1,200 miles during break-in, then annually or per manufacturer service intervals.

Can I use this in the transmission?

This is primary chain case oil only. Use Maxima transmission oil (or your bike's spec) in the transmission.

What makes this better than standard gear oil?

Maxima's shear-stable formula minimizes chain stretch and gear wear while preventing clutch slippage — keeping shifts smooth and extending component life.