Hi,
I used to use Rotella Synthetic in my Super Hawk and worked great . I found some Mobile 1 5 w-40 Turbo Diesel oil and changed it right before storage.
Think this is OK ? Or should I dump it before I ride this spring
It says rated API,SM,SL/SJ for gasoline engines.
No, drain it immediately, change the filter, then fill it up with kerosene and turn the engine over by hand 100 revolution, Make sure the spark plugs are out when you do this and plug the spark plug hokes with rubber plugs with a one way valve on them which will prevent debris from being sucked in, but will allow a little pressure to be released. Be sure to get the rubber plugs rated for the proper pressure, you don't want it to release too easily at too low a pressure or the kerosene won't circulate throughout the engine. I don't have the specs in front of me but if you Google it you should be able to find it.
Once you have done this, drain the kerosene from the bike, remove and replace the filter, remove the rubber one-way valve plugs and remove the valve cover and wipe everything in there down. While you are in there it would be a good idea to adjust the valves since you already have it apart.
Replace the valve cover using a new gasket. Once that is done, pour in new oil a little at a time through the spark plug holes. Make sure the cylinder you are pouring it into is at the bottom of its stroke, put that plug back in and turn the engine over to force the oil through the system, this will be a little bit difficult, remove that plug and move on to the next cylinder, repeat the process until you have the bike filled with oil. Now, reinstall the rubber one-way valve plugs and turn the engine over by hand 100 revolutions. Once you have done this you need to heat up the oil so it will drain properly. Do not start the engine to do this. Place a space heater under the engine making sure to have at least 4 1/2 inches of clearance between the heater and the engine. Place a thermometer into the oil filler hole and wait until the temperature is at approximately 180 degrees Fahrenheit.
Now, drain the oil, replace the filter and fill the bike up with fresh oil. Make sure you use the proper oil this time and not diesel. oil.
Replace your spark plugs with new ones, replace all the bodywork and ride.