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Which oil for cb750k2

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Pauarc:
I have now put new 10w40 oil in and changed the filter so hopefully it will help with dragging clutch I did have 20w50 in I will try again

sprinta:
Have been using 10/40W semi synthetic in both my 73 750K2 and 76  Z900A4 for several years and have had no problems with the clutch on either bike.

McCabe-Thiele (Ted):
I now have semi-synthetic in my 400 - no clutch slip either - modern oils do have lots of benefits IHTBS.

We used to run a R3mR Terrano - all the purists said you had to use mineral oil - I found it ran much quieter on semi or fully synthetic. My late mothers slab sided Micra would weep oil from the front seal for the first few days - then it would magically go as the additives worked their magic. (covered over 100k miles)

Aside from the potential  clutch slip issue (hence why I would stick with semi-S) modern oils have additives that help keep seals supple, reduce sludge/tar build ups inside the engine casings, maintain the right viscosity, have added micronised chalk to neutralise acid build up plus they get everywhere they need to. Yes they can be quite searching - hence why they can reduce engine noise.

Moorey:
 
 As has been discussed many many times before Mineral diesel oil. Preferably with a good zinc content.

McCabe-Thiele (Ted):
The Diesel option is interesting a major component of diesel oils is the detergent content that holds the carbon particles in suspension. If you change the oil in a diesel engine it's nice clean oil - within a short space of time the oil turns  black.

Having never used diesel engine oil in a petrol car it would be interesting to know how long it keeps looking clean for.

Modern petrol engines now manufactured with fine tolerances plus lean burn technology do seem to keep the oil clean looking for much longer.

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