hello to the forum,
i have a question about how choose the best antiwear oil
for my sailboat yanmar 3ym30 diesel engine, that i use
both shortly - from 15 minutes to 1 hour - at low rpm for undocking/docking operations or ungeared for battery charge,
and for long runs at higher rpm - the engine is rated 3600, i run it at 2800/2900 - , even continuosly for 50/60 hours, mostly when there's wind absence in the mediterranenan hot season - and with the engine located in a narrow engine room ventilated as it is possible -.
the operating manual states the following:
Use the following Lubricating oil:
• API Classification ........... CD or better
TBN value: 9 or more
The oil must be changed when the Total
Base Number (TBN) has been reduced
to 2.0.
*TBN (mgKOH/g) test method;
JIS K-2501-5.2-2(HCl), ASTM
D4739(HCl)
• SAE viscosity ......... 10W30 or 15W40
but then says:
DO NOT use The following engine
oils.
API : CG-4, CH-4
ACEA : E-1, E-2, B grade
JASO : DH-2, DL-1
Reason
• API CG-4, CH-4
In case CG-4, CH-4 is to be used for
YANMAR YM diesel engine series,
there is a possibility that excessive
wears occur on the valve train system
due to the content of oil.
my trouble is that i find the cg-4 ch-4 specification in quite every modern diesel oil, and btw,
i wonder which elements in the the cg-4/ch-4 oils could lead to a wear in the valve system.
most of gm/ym engine owners avoid to ask themselves any question and use the branded yanmar oil, which is thought to be the mobil delvac mx 15w40 repacked.
somewhere in the internet other people say
"never use synthetic in these engines"
is there any better choice according to you ?
cheers !
i have a question about how choose the best antiwear oil
for my sailboat yanmar 3ym30 diesel engine, that i use
both shortly - from 15 minutes to 1 hour - at low rpm for undocking/docking operations or ungeared for battery charge,
and for long runs at higher rpm - the engine is rated 3600, i run it at 2800/2900 - , even continuosly for 50/60 hours, mostly when there's wind absence in the mediterranenan hot season - and with the engine located in a narrow engine room ventilated as it is possible -.
the operating manual states the following:
Use the following Lubricating oil:
• API Classification ........... CD or better
TBN value: 9 or more
The oil must be changed when the Total
Base Number (TBN) has been reduced
to 2.0.
*TBN (mgKOH/g) test method;
JIS K-2501-5.2-2(HCl), ASTM
D4739(HCl)
• SAE viscosity ......... 10W30 or 15W40
but then says:
DO NOT use The following engine
oils.
API : CG-4, CH-4
ACEA : E-1, E-2, B grade
JASO : DH-2, DL-1
Reason
• API CG-4, CH-4
In case CG-4, CH-4 is to be used for
YANMAR YM diesel engine series,
there is a possibility that excessive
wears occur on the valve train system
due to the content of oil.
my trouble is that i find the cg-4 ch-4 specification in quite every modern diesel oil, and btw,
i wonder which elements in the the cg-4/ch-4 oils could lead to a wear in the valve system.
most of gm/ym engine owners avoid to ask themselves any question and use the branded yanmar oil, which is thought to be the mobil delvac mx 15w40 repacked.
somewhere in the internet other people say
"never use synthetic in these engines"
is there any better choice according to you ?
cheers !