brians
Well-Known Member
Is Tesco mineral 15/40 oil OK to use in a Yanmar 4JH3E? Have been trying to find API CD but unable to.
Engine oil
- Thread starter brians
- Start date
sailorman
Well-Known Member
yes
ghostlymoron
Well-Known Member
Probably yes but just to be sure, what numers and letters on the container?
pvb
Well-Known Member
It'll be OK, it's API CF, which is better than the API CD you were looking for.
JumbleDuck
Well-Known Member
From their website:
When I had a Yanmar I couldn't find CD locally, so bought it on eBay. I normally buy oil in bulk from Smith & Allan, but I don't think they do a CD.
pvb
Well-Known Member
Just noticed that Tesco is selling Castrol GTX 15W40 at £6 for 2 litres. This is also an API CF standard, so would be cheaper than Tesco's own brand oil.
Steve_N
Well-Known Member
But that is a semi-synthetic rather than a mineral oil (he points out rather timidly considering the 'debate' the mineral vs. semi-synth/synthetic issue has lead to in the past..)
pvb
Well-Known Member
Big deal...
RichardS
N/A
Welcome to the club, PVB.
Now it's the two of us against the world. :encouragement:
Richard
VicS
Well-Known Member
What is the TBN ?
If you are using ULSD you should not use an oil with a TBN greater that about 8 or 9
sailorman
Well-Known Member
Welcome to the club, PVB.
Now it's the two of us against the world. :encouragement:
Richard
I also use semi synth
JumbleDuck
Well-Known Member
It may be coincidence, but when I fed my 1GM10 semi-synthetic it immediately started drinking a min-to-max top-up's worth every three hours. Bore glazing, I think.
sailorman
Well-Known Member
Possibly just thinner oil that causes the consumption
lw395
Well-Known Member
Bore glazing is not going to happen 'immediately'.
What had you been using before?
Semi-synthetic oil is not really very different chemically from mineral oil in the actual oil content.
But the limited amount of 'mineral' oil sold these days is often bargain basement stuff with low quality additives. So what I believe can happen when switching from low spec oil to 'decent' oil is that the decent oil will move more deposits around the engine. So maybe gunge around the piston is removed, allowing more oil consumption.
My neighbours hatchback was bought as a runaround a couple of years ago. It had quite dirty oil in it and consumed oil when worked hard. Since we've changed the oil and filter twice, using a respectable brand of semi-synth, it's now looking a lot cleaner and oil consumption has dropped to the normal 'top it up once between changes' you expect from a banger. My guess is that it's now freed up the rings and everything is working better.
I think some caution is needed when changing between different sorts of oil.
But the main reason modern cars last more than double the mileage of 60s cars is the modern oil.
RichardS
N/A
My new car has 20k service intervals, which is not that unusual, but also a 2 year time interval, which is the first car I've ever owned with more than 1 year. It looks as if. slowly but surely, car engine manufacturers are catching up with my "change it when it needs changing" philosophy. I've only waited 40 years so it's still early days yet.
Richard
JumbleDuck
Well-Known Member
It was the same viscosity as I had been using, I think.
I had been using a CF mineral oil before. I swapped back as soon as I could, but it was really only running on CD which coincided with a drop in consumption - by the time I sold the engine it needed a full top-up every ten hours.