Way back in ancient times before synthetics and motorcycle specific oils, some folks used to change the engine oil, usually Castrol GTX, every 1000 to 1500 miles. Some felt it was necessary to also replace the oil filter (if the bike was so equipped) each time theoil was replaced.
The procedure I follow has always been the same: even if I replace the oil moreoften than the factory recommends, I always install a new oil filter according to their instructions.
Since 1990 I have logged more than 500,000 miles on DR350’s, DR650’s, and KL650’s. If I had changed my oil and filter an average of every 2000 miles since 1990, the cost of filters (averaging $4.00 each) would have been $1000 plus tax. On the other hand, changing the filter every 7500 miles drops the cost to $268.00.
What I’m trying to say is that the unnecessary and premature replacement of motorcycle oil filters has made untold millions of dollars for the manufacturers, so I’m sure they don’t mind if the practice is continued.
Here at Top Gun we’ll continue to use the best synthetic motorcycle oil money can buy, and change both the oil and filter according to factory specifications, which is roughly on a two to one basis.