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Mineral Oil

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Alimacdee2:
recently purchased a non detergent oil on ebay, https://www.ebay.co.uk/itm/373537080204
thought it good value,  usually buy their semi synth 10-40 motorcycle oil.
excuse my ignorance, but I see its a SAE40 anyone used sae40 in their SOHC?  any perceived problem using this oil? I’ll refrain from asking which is the best oil for the sohc..Castrol gtx.



 ;) ;)

McCabe-Thiele (Ted):
It looks as if it's not a Multigrade so imho not suitable.

Whats you reasoning to not want a detergent oil?

My understanding of detergent oils is they keep particles such as carbon & other combustion products  in suspension so they do not clog up the engine parts or corode delicate parts ? It will always look nice & clean.

K2-K6:
A bit thick at 40 as Honda (i think) give notes to use 30 viscosity if single grade over 59 F ambient.

That won't damage it, but warm up is the penalty by being essentially too thick by some margin. For UK temperature range and generally more summer, then 30 viscosity would be ideal in single grade.

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.

Athame57:

--- 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.

--- End quote ---
Does this mean I'm to be told the 10w40 mineral oil I use is wrong?  ???

K2-K6:

--- 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.

--- End quote ---
Does this mean I'm to be told the 10w40 mineral oil I use is wrong?  ???

--- End quote ---

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.

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