SOHC.co.uk Forums > CB750
How hot should it get?
Bryanj:
Forget synthetic for one of these
K2-K6:
Apart from the standard issue clutch debate, are there any specific reasons to sdvise against running synthetic?
Bryanj:
Way over speced for these old motors and overpriced to boot
K2-K6:
I agree completely with your cost argument as if you change it often enough then a lot of the claimed benefits for extended service intervals don't apply and the costs that go with them for a high spec oil can be avoided for these motors.
Buuuuut, your thinking about using a basic diesel oil to get the right spec for these caused me to further work through that path of logic and to try looking at some specs and usage for various different stuff I run and I've got to an asda supplied synthetic diesel oil of 5w 40 grade but with a VW spec 505.01 oil that is used in their PD diesel engines. This is specced to avoid very high camshaft operating mechanical pressures that those engines have and also support the elevated temp in the turbo casing and a certain amount of contamination from combustion blow by getting past the piston rings. Asda sell it at five litres for £20 so a reasonable cost.
In terms of the original question about high oil temp I feel it maybe a reasonable option if it does prove to be running a bit hot.
MarkCR750:
Had a good ride out this morning, I think I was worrying too much, holding the back of my hand (the back of my hand is in calibration , yellow sticker in date) I can barely feel any radiated heat an inch and a half away, so I think all is well, I'll still fit an oil cooler cos it can only be a benefit, and measure the oil temp, thanks for your posts .
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