Engine Oil 1GM10

greggron

greggron

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Last season I acquired a Sadler 25 fitted with a fairly new (2009) Yanmar 1GM10. I keep the boat on a swinging mooring in Porsmouth Harbour.

I want to change the oil in the motor along with the oil filter. I have looked at the Yanmar service manual but frankly I am non-the-wiser on what oil I should be using. Can anyone please advise? Does it have to be marine oil or will vehicle oil of the right spec do?

Any other relevant tips, tricks or things to look out for would be welcome too.

Many thanks
 
I've just changed the oil in my 2GM20 for 15W40 API CF, which is apparently as close as you can get to the now-obsolete official specification without ordering special stuff from special suppliers.

Not as scary as it sounds - it comes in 5-litre black bottles in Halfords, labelled as being for diesel cars from 1980 to early 90s.

Pete
 
prv said:
I've just changed the oil in my 2GM20 for 15W40 API CF, which is apparently as close as you can get to the now-obsolete official specification without ordering special stuff from special suppliers.

Not as scary as it sounds - it comes in 5-litre black bottles in Halfords, labelled as being for diesel cars from 1980 to early 90s.

Pete
Click to expand...

Thanks

Castrol GTX is 15W-40 API SL - will that do?
 
No need for that high spec. Buy the cheapest oil from Halfords, Tesco, Asda etc. 4 litre will do you two years.
 
Any Oil is better than No Oil

A Yanmar engine fitted to a yacht will never ever actually wear out,
it will die of corroded parts, loss of oil from burst oil lines, disintegrated casings, bent conrod (from water over filling the trap) - all these things I have seen, but worn out from occasional use during a short sailing season - never. Canal boats and fishing boats etc that are continually motoring all year round, maybe.

So actually it doesn't matter much what you use, just cheap stuff and change it at the end of every season to get rid of the moisture in it.

(proud owner of 30 year old 1GM and also Thornycroft T90 used a lot but still only 3500 hours in 30 years.)
 
Appledore said:
"Re: 1GM10 oil type & quantity?
.25l Engine oil SAE 10W -30 CC class

Straight from the workshop manual. "

From the Forum quoted.
Click to expand...

I don't have that manual. I'm pretty sure that mine (not here) says 15 W - 40 API CD and that would coincide with my opinion that a 10W oil is too thin for a marine engine. The only value in modern low viscosity oils is fuel economy, which require hardened crankshafts and special bearing materials. I'm not sure that Yanmars have them.

API CC remains fairly obtainable, although CD seems to have largely disappeared. Canal boats universally use it, Morris Lubricants market it and many classic cars still burn it:) otherwise, as said, API CF is the nearest you will get easily.
 
BLIMEY!

Blimey! I never knew engine oil was so complicated.

Thank you for all the input.

I have some SAE 15W-40 API CF oil in the garage. Can I use that rather than purchase more?
 
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