Mineral Engine Oil -again - sorry

Ian_Edwards

Ian_Edwards

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I'm finding it increasingly difficult to find mineral oil for my Yanmar 4JH4E.
My local garage only stocks synthetic oils or semi synthetic, as does my local super market.
Yanmar say 15W40 API CI-4 CF-4
Yanmar branded oil is now £50+ for 5L
I need 6L for and oil change.
I've found a supply of Comma 15W40 , says "API SL CF CG-4" on the label, is that suitable for my Yanmar?
I've tried googling API SL CF CG-4, but can't find anything that makes sense to me.
 
Like you went through this back in February for my Yanmar 4JH2-E.

Have a look at Shell Rimula R4 X 15W-40.

I ordered a 20Lt drum from www.opieoils.co.uk back in February which came with free delivery. Cost then was £80.95 with a 10% discount. There are quite a few recommendations for Opie Oils from other "oil" threads on this forum.

This drum should last me 3-4 years and works out somewhat cheaper than the 5 Lt can.
 
I keep revisiting this topic because If find all the different specification confusing, I typically buy two 5L containers of oil a year, for the Yanmar and the generator. Last time I ran out of time and bought Yanmar brand from the local chandlery.
I don't have room to store 20L either at home or on the boat, I buy two 5L containers, use one immediately to change the oil on the Yanmar, the other 5L is kept on board to change the oil in the generator (2L) and as a top-up supply
I can't find anywhere online where I can buy the Duckhams.
It's till not clear to me that the Shell Rimula fits the bill, and the 5L containers are out of stock.
I have found a stockings of the Comma 15W40 API SL CF CG-4, at a reasonable price, free delivery.
I've just checked the manual again, it says CD of higher, no mention of -4 or anything.
I think I'll jus go for the Comma, it CF and CG-4, which are both higher than CD.
Otherwise I'll just spend more time going around in circles.
 
Ian_Edwards said:
I'm finding it increasingly difficult to find mineral oil for my Yanmar 4JH4E.
My local garage only stocks synthetic oils or semi synthetic, as does my local super market.
Yanmar say 15W40 API CI-4 CF-4
Yanmar branded oil is now £50+ for 5L
I need 6L for and oil change.
I've found a supply of Comma 15W40 , says "API SL CF CG-4" on the label, is that suitable for my Yanmar?
I've tried googling API SL CF CG-4, but can't find anything that makes sense to me.
Click to expand...
Loads of 15/40 mineral oil on ebay.
 
Smith and Allen are another good source of cheap (price not quality) oils. I bought a 20L drum of C1 low SAPS oil for my diesel Jag for about the price of 10 litres from many other suppliers. They have been blending oil in the UK for nearly 100 years so they know what they are doing. They also seem to have oils suitable for the OP's engine.
 
Why not synthetics or semi-synthetics? There is nothing in the Yanmar spec that suggests that. Any good oil will exceed CF, which is somewhat obsolete.

An obvious old school choice would be Rottela T4.

Google API and SAE classifications. For even more confusion (bluring the synthetic-conventional line), read up on base oil groups. Nearly all conventional engine oils are a mix of group II and group III oils, and both of these blur the line between conventional and synthetic in terms of chemistry and performance. https://www.machinerylubrication.com/Read/29113/base-oil-groups

ENGINE OIL
Engine Oil Specifications
Using engine oil that does not meet or
exceed the following guidelines or
specifications may cause seizure of parts,
abnormal wear and shorten engine life.
Service Categories
Use an engine oil that meets or exceeds
the following guidelines and classifications:
• API Service Categories CD, CF, CF-4,
CI and CI-4.
• SAE Viscosity: 10W-30, 15W-40. Engine
oil 10W-30 and 15W-40 can be used
throughout the year.
NOTICE
• Be sure the engine oil, engine oil storage
containers and engine oil filling
equipment are free of sediment or water.
• Change the engine oil after the first 50
hours of operation and then at every 250
hours thereafter.
• Select the oil viscosity based on the
ambient temperature where the engine
is being operated. See the SAE Service
Grade Viscosity Chart (Figure 5).
• Yanmar does not recommend the use of oil additives.
 
Morris oils in Shrewsbury near me produce mineral oils of various viscosity suitable for simple marine diesel engines. Available at chandler's around here.
 
Some years ago Yanmar stated in their workshop manual for the YM series engines that API CG-4 and CH-4 oils should not be used in this engine. I do not know why and it seems from correspondence by others to Yanmar that this may not have been what they intended!

However they do recommend API CI-4, to which their own oil complies. I have been suggesting for several years that this is an excellent grade to replace the far older ones that many of us continue to use.
 
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