Topic: Engine Oil For '73 CB750K3

[earth tones]

Just put 10W-30 into the bike instead of 10W-40.  Heading into the fall/winter months of Austin, TX....what performance differences could result?  Is it just that the 10W-30 will flow better in hot temperatures?  Thanks so much.

[Markcb750]

I use a different type of oil every time I change, always 10w 40, except in summer when I run 15 w 40, unless I cannot find it, then I run 20w 50,unless I have some 10w 40 around, I just use it, even if it is not a "different" type of oil. So, I guess my original statement was more of a general concept, not a personal commitment.





BTW:

I re-polish my oil filter housing every time I change the oil.


I add a little Sea-Foam to the oil about 100 miles before I change it, unless I forget, or the mood to wrench & polish hits me and I just change the oil.

[Logan80]

I use a different type of oil every time I change, always 10w 40, except in summer when I run 15 w 40, unless I cannot find it, then I run 20w 50,unless I have some 10w 40 around, I just use it, even if it is not a "different" type of oil. So, I guess my original statement was more of a general concept, not a personal commitment.





BTW:

I re-polish my oil filter housing every time I change the oil.


I add a little Sea-Foam to the oil about 100 miles before I change it, unless I forget, or the mood to wrench & polish hits me and I just change the oil.

 

[wrenchmuch]

10w-30 will thin out a lot when your engine warms up . At idle you might see the oil light come on . I personally won't run anything lighter than 10w-40 .