Greetings all,
I'm wondering if some people on this site can give me an insight into the sudden consumption of oil by just changing to a synthetic.
The motors in question are from 3 Yamaha FXHO Crusier Waverunners. Two are mine (one is my wife's) and the other is a mates.
A little history ... The motors are 4 cyl, 4 stroke, 1052cc producing 160hp at 10,050 rpm. They are twin cam, 5 valve engines running 11.9:1 compression from the factory. They have a dry sump system and a scavenge pump pulls the oil into a tank that supplies the pressure pump to circulate the oil. The sump and tank capacity in total is 4500ml ... with approximately 2500ml being able to be sucked out via the oil tank at the specified change intervals. You only get a half change per interval ..we have all shortened the interval by half !
It is a marinised version of the Yamaha R-1 Motorcycle engine.
All 3 craft have approximately the same hours, 90,115,120 (late models 05-06s) with round 2000 hrs being the reasonable engine service life. They were run in per the Yamaha recommended method which seats the rings well and is backed up by a comp test (162psi) and the lack of oil consumption with the Yamalube 10w-30 4 stroke mineral motor oil... as recommended by Yamaha.
In the last 2 months we have changed all craft to the newish Amsoil Formula 4 stroke Marine Synthetic 10w-30, which meets FC-W spec, in an effort to minimise engine wear and have the benefit of extra corrosion additives (protection) of the FC-W spec.
Oil consumption is now happening on all 3 craft at the rate of about 500ml per 6 hrs running. We cant believe it !!! I might of added 250ml before but it was around 50 hrs running on the Yamalube.
Obviously we all want to change back to confirm that the Yamalube will now not be consumed (doubt it) The plugs all look fine and the craft are running very well ... we use Premium 98 Octane fuel from a reputable supplier ..
Can someone shed some light please ???? Why would it consume the same viscosity base oil (10w) Are the synths super runny with additives now making the 10w spec ???? What is going on ...
Thanks ... in advance ...
Regards
Anthony
I'm wondering if some people on this site can give me an insight into the sudden consumption of oil by just changing to a synthetic.
The motors in question are from 3 Yamaha FXHO Crusier Waverunners. Two are mine (one is my wife's) and the other is a mates.
A little history ... The motors are 4 cyl, 4 stroke, 1052cc producing 160hp at 10,050 rpm. They are twin cam, 5 valve engines running 11.9:1 compression from the factory. They have a dry sump system and a scavenge pump pulls the oil into a tank that supplies the pressure pump to circulate the oil. The sump and tank capacity in total is 4500ml ... with approximately 2500ml being able to be sucked out via the oil tank at the specified change intervals. You only get a half change per interval ..we have all shortened the interval by half !
It is a marinised version of the Yamaha R-1 Motorcycle engine.
All 3 craft have approximately the same hours, 90,115,120 (late models 05-06s) with round 2000 hrs being the reasonable engine service life. They were run in per the Yamaha recommended method which seats the rings well and is backed up by a comp test (162psi) and the lack of oil consumption with the Yamalube 10w-30 4 stroke mineral motor oil... as recommended by Yamaha.
In the last 2 months we have changed all craft to the newish Amsoil Formula 4 stroke Marine Synthetic 10w-30, which meets FC-W spec, in an effort to minimise engine wear and have the benefit of extra corrosion additives (protection) of the FC-W spec.
Oil consumption is now happening on all 3 craft at the rate of about 500ml per 6 hrs running. We cant believe it !!! I might of added 250ml before but it was around 50 hrs running on the Yamalube.
Obviously we all want to change back to confirm that the Yamalube will now not be consumed (doubt it) The plugs all look fine and the craft are running very well ... we use Premium 98 Octane fuel from a reputable supplier ..
Can someone shed some light please ???? Why would it consume the same viscosity base oil (10w) Are the synths super runny with additives now making the 10w spec ???? What is going on ...
Thanks ... in advance ...
Regards
Anthony