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10w30
50
.020
1) Check the blower motor, make sure it is not making any weird noises.2) Check the blower motor resistor, its located next to the motor. It is what controls the lower speeds of the motor. You can try to find one at the junkyard.
SAE 10w30 full synthetic.
If it is a Kohler motor it is a Champion H10 ,
50mph
If it is a clicking or popping sound it is probably a CV joint. If it sounds more like the car is coming apart you might have a broken motor mount.
The heater motor is failing.
DOES IT DO IT WHEN YOU RUN THE A/C ALSO? IS THE SOUND COMING FROM THE PASSENGER SIDE BEHIND THE DASH? IF SO IT COULD BE THE BEARINGS GOING BAD IN THE FAN BLOWER MOTOR.
The oil to use for the 26hp Kohler motor on a Craftsman garden tractor will depend on the temperature outside. Use a 10-30 blend in the summer and a 5-30 blend in the winter months. The brand of oil does not matter as long as it is not a synthetic blend.
The motor options that are available for Kubota RTV are; The Briggs and Stratton Pro or Kohler Courage Pro. These motors are available to purchase online at sites such as Ebay.