What is considered â€œnormalâ€ oil consumption for a 1000cc Yamaha RX 4-stroke engine? Anything up to one quart per 1,000 miles, according to Yamaha. With a high-revving high performance engine like this it will use some oil under normal operating conditions. Anything over one quart per 1,000 miles is considered excessive.
Many conditions can contribute to excessive oil consumption, including improper break-in, engine modifications, clutch modifications, and extended high-speed or high engine RPM operation.
Incorrect oil level checking technique can cause a â€œfalseâ€ low oil level reading, leading the owner to believe the sled is using oil. This can also cause overfilling. Yamaha suggests checking the oil level only when the engine is fully warmed up, having run for at least ten minutes. Do not add oil unless the oil level reaches the â€œEâ€ mark on the dipstick (which should be marked â€œLâ€ for â€œlowâ€ instead of â€œEâ€, which usually means â€œemptyâ€). Do not fill the oil tank above the â€œFâ€ mark on the dipstick, as overfilling can cause excessive crankcase pressure and actually increase oil usage!
If excessive oil consumption is truly identified, Yamaha suggests first using their â€œRing Freeâ€ fuel additive to â€œshock-treatâ€ the engine and remove internal engine deposits. Two ounces of Ring Free should be used per gallon of fuel for 2-3 full tanks (20-30 gallons). After this treatment, the engine oil and filter must be changed, using Yamaha 4-S 0W-30 synthetic blend oil (or Yamaha 4-CW 5W-20). After this, Ring Free should continue to be used at a rate of one ounce per ten gallons to prevent further engine deposits.