Mine has done that once before, it had been sitting in a container for 3 months on the way back from NZ, on startup a great splurge of oil came out of the filter. After cleaning it all up and the floor of the shippers warehouse it started and ran fine all the way home and ever since with no reoccurrence.
That is interesting, how did it get out the air filter?
Not exactly sure, but I guess the sump had filled with oil and the path of least resistance was up the breather to behind the air filter, the engine actually started easily followed immediately by a gulping noise and the oil coming out.
This makes more sense now I have been to see the half disassembled engine, I didn't realise the crankcase breather actually connects to the oil filter housing! I thought that line was an oil line running behind it..
Looks like the same has happened to mine, period of inactivity and a bit to much oil in the sump. I am asking them to check the oil lines as a precaution for blockages, incase that is what caused a little build up in pressure?
Perhaps reroute the breather to an oil catch tank may be a worthy upgrade..rather than the air filter box?
It would make more logical sense wouldn't it
