SOHC.co.uk Forums > CB500/550

CB550 K3 engine oil - what to use.

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deltarider:
If you don't start and ride at temperatures below zero, 15W-40 is an even better oil. Plenty of choice. I myself use Castrol GTX High Mileage 15W-40 as it helps to keep the rubbers supple. Leaking O-rings are often a problem in old engines like ours. I always park my bike on the main stand and hope it will keep as much oil as possible at the cam.

corromant:
I had a 550 K3 new in 1977 & at that time there was no such thing as motorcycle specific oil, you went to the local motor shop & bought whatever was available in the grade you wanted. So if it was good enough in the early days of the bike don’t see any problem doing the same now, just avoid the fully synthetic oils.

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