philg Posted December 27, 2006 Share Posted December 27, 2006 I recently bought a 98 LS400 and it is due for the 120k mile service. I am doing it in bits and pieces. I have done the air filter, oil, and am flushing the brakes. How important is it to do the spark plugs every 30k miles? Also how important is it to change the transmition fluid and is there any way to tell when it is ready for a change (discoloration similar to engine oil? or is there no such sign?) Quote Link to comment Share on other sites More sharing options...
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