Best oil for old motors

[guzziman]

What oil should be used in a '67 Honda 90cc 4 stroke (and why)?

 

[guzziman]

Guzziman

 

[ZZman]

Probably for that bike a good conventional 10-40w would work well. I would not use Syn oil as I don't know if seals back then would be compatible.

 

[dwendt44]

A high mileage 10W-40?

 

[paul246]

I had a '64 Honda C200 (87cc) that I recently sold. I used Mobil 1 15w50 in it with no problems. Never had a leak and it never used oil. Great little engines!

 

[G-MAN]

Originally Posted By: dwendt44
A high mileage 10W-40?


That's what I'd use.

 

[road_rascal]

Or a diesel oil like Rotella, Delo 400 or Mobil Delvac (all 15w/40). This is what I use in the XS400 (and now sold KZ750).

 

[1WildPig]

I had a CL 100 Honda in 1972 and I believe it called for a 30 weight oil...so either a straight 30 or 15-40 such as Rotella would be my suggestion as it still has all the additives needed for an air cooled engine.

 

[harley145000]

dump some rotella in it

 

[mrsilv04]

I'd use some 15w-40 Rotella in it.

 

[PT1]

Originally Posted By: mrsilv04
I'd use some 15w-40 Rotella in it.


+1

 

[SD26]

Yeah, I mean I'll agree on the Rotella.

You could use a little AutoRX in it too to clean out the engine very gently too over time.