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Author Topic: Which Engine Oil  (Read 1873 times)

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Offline clintcd

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Which Engine Oil
« on: June 15, 2013, 01:56:45 AM »
Can anyone tell me which replacement engine oil to use in a 1977 cb750a, Haynes manual lists Castrol GTX  for all cb750's including the hondamatic, is this correct?, can the "A" take synthetic or semi synthetic oils

Thank you
clintcd
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Offline trueblue

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Re: Which Engine Oil
« Reply #1 on: June 15, 2013, 05:41:07 AM »
I personally run Lucas 10w40 semi synthetic in my 650, I like it.  The bike seems to as well but I can't comment on the A's. ;D 
One thing you will learn on this forum is opinions are like arseholes (especially when it comes to oil), everyone has one and most of them stink ;D.  Oil threads are boundless if you do a search and most of them are full of crap.  But now I will just pull out my popcorn and watch. ;D


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1979 CB650Z
Nothing can be idiot proofed, the world keeps producing better idiots.
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Offline 70CB750

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Re: Which Engine Oil
« Reply #2 on: June 15, 2013, 05:51:25 AM »
It can take synthetic. but after a while - say few years - it will leak.  The reason is the excellent ability of synthetic to cut crud - it will remove deposits in gaskets and make them leak.

I personally have synthetic Mobil 1 15W-50 in my K0 as of now - for the summer and fall - and the plan is to go dino again.  Some folks run semi synthetic too.  When I run dino, I use Mobil Delvac - oil for diesel trucks.
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Prokop
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Offline raymond10078

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Re: Which Engine Oil
« Reply #3 on: June 15, 2013, 07:22:05 AM »
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1978 CB750A (upgrading very, very slowly)

Past bikes - Honda: SL350, CX650C, CB900C, CB1000C, CM450A; Kawasaki: several 1972 750 H2's; Suzuki: TC90J.

Bikes I want: CX650ED, a mid-sized japanese V-twin with ABS.
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