SOHC.co.uk Forums > CB750
Which oil for cb750k2
Johnny4428:
Worthwhile info there Ken! Not long since I watched a video with a wrecked engine due to the spring placed between filter and engine!
Laverdaroo:
Just my two 'penneth but whilst service manager at hed offic for MotorcycleCity amillion years ago we would never put fully synthetic oil in anything that didnt have a dry clutch as it simply made the clutch slip as previously mentioned. Even if the customer requested it. Its too thin and semi was always the best as stipulated by the manufacturers. TheDucatis loved the fully synthetic but dont rely on it for the clutch plates as you know hence the choice but try a early 2000's fireblade with standard clutch springs and fully synthetic oil and it doesnt want to drive out of the corners with the throttle pinned or hit max speed in top, the clutches simply let go and used to be noticably loose all over the place.
The folk that used to ask for it were the same guys who used to balk at the cost of tyres asking why they could get a set for cheaper for their car. When asked if their car would go over 170mph and or change direction from one side of the tyre to the other in less than a second, the answer was always, "EErrr, no.......I see what you mean".
Always soldiers with everything on tick from accross the road at the Aldershot barracks, they always asked for the most expensive and didnt know why. Cannon fodder (pardon the pun) for a new bike salesman in the show room after which they were always introduced to the race leather salesman who always managed a suit, new lid, gloves and boots out of them at the same time beforee thay left ;D
Getting back on track, leave really expensive oils for really expensive engines, these motors arent that fancy and simply dont need it. AND, save yer brass ;)
More expensive is often, still no the best.............
SeanFD:
On the road in Africa, and Europe for that matter, the choice of oil is limited, if there is a choice at all. In temperatures ranging from low single figures to the high 30ºC, these are the oils I used:
Motul 3000 4T 20W50 ; Motul 7100 4T 10W40 ; Total 4T Special Hi-Perf 20W50 ;
Castrol GTX Diesel 15/40 ; Total 4T Special Hi-Perf 20W50 ; Fuchs Titan Truck Plus 15W40 ;
Castrol Actevo 20W50 4T ; Moto Quip 4T Street 20W50 ; Ipone R4000 RS 20W50 ;
Liqui Moly 4T 10W40 ; Liqui Moly 4T 20W50 ; Liqui Moly 4T 20W50
The only one that gave me bother was the Motul 7100, a 100% synthetic, MA2 rated oil. While using this, a weep started at the cylinder head gasket and this plagued me throughout the rest of the trip - quite spoiled my new riding jeans.
On the US site, I read a post, by Hondaman I think, that it was not unknown for synthetic oils to seep through the head gasket in this fashion. Needless to say I never used it again. I also read that low detergent oils are better for our bikes.
Now I'm certainly not an expert, but the lesson I took from the experience is that any high quality oil will do the job, if it is changed frequently enough.
I now use the Liqui Moly 4T 20W50 or 10W40 when I can get hold of it.
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