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Is beeps twice like every 2 minutes and if i try to drive faster like 25 knots it gives Guardian mode and says reduce throtle until i drop to around 2500-3000rpm. engine runs fine on idle and on higher rpms. Pressures ok and temporatures ok. Changed impeller and added plenty of fresh gas after...

I have 2006 boat witk kohler generator. What coolant type and what engine oil type should i fill in ? I have no manual to find the specifications.