I have used an oil flush in my car when it hit 200K - main reason I tried it was because a good friend recommended it. No complaints, used it in my car and my mum's ek4 which has 240K on the clock. Cleaned the engine right up and both cars have been idling even quieter since.

as for servicing, oil changes and easy stuff I do at home....

cost of honda oil filter is approx $15. Cost of oil approx $45.