If you find rpms go up and your speed does not that sounds like the clutch is slipping and that, if so, will quit altogether real soon.
The coolant and oil should be monitored and maintained. There could be a problem if you have to keep filling them up. Some engine oil use may be ok but coolant should stay stable once filled,
T
Tom Greenleaf - MetroWest Boston - USA
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http://www.autoacsystems.com/tomgreenleaf/