Changing Diff & Engine Oil
Engine Oil
The engine oil levels should be checked regularly through the sightglass. The level should be between the "L" (low) and "F" (full) levels etched on the left.
Only use recommended synthetic oils and filters.
Taking off the rear left wheel can make removing the oil filter easier, especially on dual-tank cars. Consider using a flexible funnel or other apparatus to avoid oil spilling onto the header wrap. If oil does spill onto the header wrap (a small amount is inevitable), run the engine outside for some time before taking it on track, to allow the oil to burn off the wrap. Don't skip this, or you risk being black flagged when the flaggers see smoke on the track!
An oil change is absolutely the cheapest thing you can do to extend engine life. Remember that the gearbox and engine use the same oil system. While we recommend every 10hrs of operation, we personally do it after every weekend event! Be kind to your engine and you should expect around 150hrs of track use before a rebuild is necessary.
A warning light is shown on the dash every 640mi (approx 8 hours) to indicate that the oil should be changed. Dash Alarms
Diff Oil
Changing diff oil is very easy on the Rush SR.
Lift the back of the car and spin the rear wheels, noticing the two drain holes in the middle of the diff. Spin the diff so that both holes are at approximately the 10.5 and 1.5 o'clock position, and remove the plugs. Then spin the diff downward so the oil drains.
In this photo, the owner used an M14x1.5 barbed fitting to make draining the oil cleaner. This isn't necessary if you have the right pan, but it can be helpful!
Once the oil is drained, prepare your new oil and rotate the diff so the holes are at the 12 and 9 o'clock positions, like the top photo. Fill with oil slowly until oil starts to come out of the 9 o'clock hole. We recommend you replace the copper washer on the drain plugs, and torque to 16 ft-lbs with blue thread locker.
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