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with a good engine flush (amsoil makes one) and then change the synthetic and filter again in 3-5K depending on what your dipstick looks like...if it gets really filthy/black in 3K change it or at least get an oil analysis of the oil.
I change my 87 900T engine oil every 10K although I'm using an amsoil bypass oil filter. Carbon particulates are the problem at that extended drain interval although the rest of the oil test specs (wear metal ppm) are negligible.
posted by 198.26.74...
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