Terry, as Etec says I think your running the motor to hard,I travel out at about 4000 and do about 18 -20 knots, and average 1.33 litres per nm which equates to 6 mpg, and of course does'nt use any oil as its a Mariner 115hp 4 stroke.I have now had my Optimax 115 for a few months and have done about 65 hours on it. I knew the oil consumption was going to be high for the first 20 hours, which it was :sad:, but now that it is well run in I am still using between 2-3 litres for every 80-100 litres of fuel.
At £43 a can (Mailspeed Marine have now realised they were doing it too cheap at £27:thumbdown) this adds quite a bit to the running costs.
Does the consumption sound right or should I get it checked out?
I generally run at between 4500 and 5000 rpm while travelling and then around 2500-3000 rpm to get back to the start of the next drift when wrecking. If conditions are a bit choppy then I will usually keep it to around 3500 rpm for travelling.
Nothing seems to make any difference to how much oil I use.
I had an ETEC a few years ago and kept it for about a year. I only had to refill the oil once, just before I sold it and was expecting the Optimax to be similar.
I would be interested to hear what consumption others are getting.
The fuel consumption is around 3.5 NM per gallon so a bit better than the 100 mariner 4 stroke:thumbs:.