Recommended draining and flushing procedure when changing from
mineral oil to Castrol R - or vice versa:
1. Drain the mineral oil (Castrol R) when warm.
2. We recommend the following:
Flush the engine. After draining the Castrol R, refill with Castrol
Flushing Oil* to a level approx 25-30mm above the normal fill level.
Restart the engine and run at fast idle for 5-10 minutes. During
that time, the engine should be given a few bursts to moderate
revs.
NOTE: The vehicle should not be driven or the engine put under
heavy load during this period. Stop engine and thoroughly drain all
flushing oil and replace or drain any filters in the system.
3. Refill with the desired Castrol R (or Castrol engine oil) grade.
Please consult Castrol office for recommendation if Castrol
Flushing Oil not available.