SOHC.co.uk Forums > CB750
Which Engine Oil should I use ?
Trigger:
--- Quote from: Chris400F on December 01, 2016, 02:51:14 PM ---
--- Quote from: Trigger on November 30, 2016, 07:41:42 PM ---.... as long as it is to the right spec, I am happy.
--- End quote ---
Trigger, I think you could have unwittingly struck the metallic pin squarely on the cranium here.
What is the right spec? Oils have changed vastly since the bikes were new 40+ years ago.
The original specifications for my 400/4 call for an SAE 10W-40 oil of Service SE Grade. Nowadays this is referred to as the API specification; in 1977 SE was the highest specification available. My understanding is that within reason the later higher specifications supersede the earlier ones.
The Millers oil I referred to has a 'Performance Profile' of API: SG, SH, SJ and JASO: MA / MA2. The JASO classifications seem to be for motorcycle-specific oils. The Millers oil is suitable for off-road, on-road and track motorbikes, and is for use in motorbikes fitted with oil immersed 'wet' clutches. I am happy it is right for my bike.
If I look at the Triple QX oil in Greebo's link I see it is classified A3 B3 B4. These specifications are for car and light van petrol and diesel engines. They may be perfectly suitable for use in bike engines but I can't link between the different sets of standards.
So my choice is to stick with a motorcycle-specific oil. It doesn't cost me a great deal more, and as I only run the one bike the difference isn't multiplied several times. as it would be for others on here.
So, bottom line (literally), what standard/specification would you be looking for in your 'Trade' oil?
--- End quote ---
Yes Chris, it is a little confusing as they keep moving the goal posts with new numbers and letters.
Had a bit of time toady and found some strong glasses to read the small print.
10W-40 Semi Trade Premium has ACEA A3, B3, B4, API SL/CF, MB229.1
Mineral Trade has API CF-4: AC EC A3, B3
Back in the 90's we used Castrol GTX on every Japanese bike .
Paulreade:
Just continuing on from this post, the Honda manual states sae 10w-40 castrol gtx. I haven't done any further research as yet as I won't change the oil for 2-3 months. That said is the castrol gtx the, the oil that is generally advertised and used on cars etc ? Or is there a specific motorcycle gtx version ?.
I'm running a cb750 k6, it will probably run less than a 1000 ( gentle) miles per annum so looking for a decent value oil ( recommendation) - as I guess putting a premium quality oil in could be a waste and in addition may perhaps play havoc with oiled seals I suspect ?????
Any advice welcome.
Bryanj:
The 750 needs oil changes more frequently than the Porsche because the gearbox hammers the crap out of it
adespin:
So there doesn't seem to be a definitive answer as to which is the best oil for the cb750, should we use part synthetic or non synthetic, premium priced or economy, i'm just as confused now as when i first started to read this thread :-\, and i was hoping there was a consensus as to the best oil to use,
Nurse Julie:
--- Quote from: adespin on August 06, 2018, 07:16:45 PM --- So there doesn't seem to be a definitive answer as to which is the best oil for the cb750, should we use part synthetic or non synthetic, premium priced or economy, i'm just as confused now as when i first started to read this thread :-\, and i was hoping there was a consensus as to the best oil to use,
--- End quote ---
You will get at least 28 different answers on what oil to use and at least 100 different reasons why to use a certain type. We use Trade Premium 10w40 Mineral and Trade Premium 10w40 semi synthetic, not mixed together !!. Its as cheap as chips but does the job just fine. We find both are good, the mineral needs changing every 1000 miles, the semi, yearly. It is the frequency of changing the oil that saves these engines. Expensive motorcycle engine specific oil is a waste of money, its just oil companies advertising their wares hoping that motorcycle riding muppets will fall for it.
Edit......before anyone asks we use Mineral for running in and then on to the semi synthetic.
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