I've got what I think are noisey tappets. They are prevelant when I start up from complete cold. Also, when I accelerate under load in a high gear it taps almost to the point of sounding raspy, so it maybe a problem with the down pipe with regards to the former problem.
Anyway, it needs an oil change now. I've never used any form of engine flush as I've heard it does nasty things like burn out valve guides and strips piston bores. Am I right?
Are they any good products an the market that people recomend? Engine only done 50k.