Below you will find the best synthetic oil for a 1991 Yamaha 9.9 (2-cyl. 4-stroke. 14.15cid). Maximize your vehicle's potential with 100% full synthetic oil that is made in the USA! For more than the past 50 years, AMSOIL has perfected the art of maximizing efficiency and engine life. The advanced synthetic formulas deliver superior protection from heat, friction, and wear, keeping engines as good as new for miles. Upgrade to AMSOIL today and experience better performance, reliability, and reduced oil consumption. Click add to cart for more details. Sign up as a preferred customer and get discounts and more! The oil type, capacity and oil filter (if available) are listed below and verified for accuracy. Upgrade now!
Recommended oil for my 1991 9.9 (2-cyl. 4-stroke. 14.15cid)
| Product Name | Product Description | Capacities | Product |
|---|---|---|---|
| Engine Oil AMSOIL 10W-40 Synthetic Marine Engine Oil |
Protect your 1991 Yamaha 9.9 (2-cyl. 4-stroke. 14.15cid) from heat and stress due to high rpm usage. Protects from wear and tear, rust, corrosion. Worried about protection from inactivity? We got you covered! This marine engine oil will protect your engine when in storage. Awesome oil for boat enthusiasts who want the best protection! Made in USA. | Capacity 1.06 Quarts |
WCFQT-EA
Add To Cart  Add To Cart |
| Gear Lube AMSOIL Synthetic Marine Gear Lube 75W-90 |
Fantastic performance for gears and awesome protection from shock loading. Fights foam and keeps extreme pressure standards even when contamination reaches 10% from water. Great lube for V-drives, bow/tunnel thrusters, lower units, sterndrives, and transmissions. Also great for ATVs. Made in USA. |
AGMPK-EA
Add To Cart Add To Cart |
Boost your boat’s performance by using synthetic marine motor oils that resist viscosity loss. Synthetic oils also resist thermal breakdown, reduces engine wear, and high detergent additives prevent valve sticking.
