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Mineral Oil
Athame57:
--- Quote from: K2-K6 on April 03, 2025, 04:29:06 PM ---
No, it has slightly more range at lower temperature than originally specified in reality. Thst won't hurt you, it'll flow better at cold start which will help with longevity.
The original spec was PROBABLY inhibited slightly by the base oils and polymer materials available when contemporary, likely improvement in current oil blends is probable.
--- End quote ---
Aaah---sooo..... I can sleep in peace again! That is good. ;D
K2-K6:
Yup, all good and generally the ambient temperature "up the smoke" are a little up on out in the sticks too. Quite snuggly for an air-cooled engine :)
Its funny the numbers they use on oils anyway, both the 10w and 15w are thicker in effective viscosity than the 40 :o
There's a lot hidden in those specs on the can.
McCabe-Thiele (Ted):
--- Quote from: Athame57 on April 03, 2025, 04:11:28 PM ---
--- Quote from: K2-K6 on April 03, 2025, 03:26:48 PM ---
Nominal oil spec for these is Mineral 15w40 which is effectively a 20 viscosity native oil, plus pour point supresant (making that 15w spec) with "multigrade" polymer to give flow characteristics of 40 viscosity @ 100 degree C.
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Does this mean I'm to be told the 10w40 mineral oil I use is wrong? ???
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That looks more suitable to me, multigrade & has detergent. ;D
Alimacdee2:
thanks for that, always thought mineral oil may be more suitable for these air cooled engines, anecdotal but synthetic oils always look very thin to me when really hot, semi synth I suppose is giving you the best of both worlds. Looks like the sae40 is a non starter then, I’ll have to find a use for it, unless I buy an Austin 7 at Mathewsons!
Bryanj:
Got a lawnmower?
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