petrol car oils are non detergent oils.
*most* diesel oils are detergent based.
cold starting apart, once a lube oil is up to temperature its cleanliness (filtering / changing) is more important than its weight
I very much doubt you can buy a grade of oil too low a spec for a lister.
castrol agri power 15w40 is available at any farm supplier (the ordinary agri, not the plus ones) and will work fine
Agri Power
Engine oil
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Applications; Applications
Suitable for use in older machinery or those operating under moderate operating conditions
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Features / Benefits; Features / Benefits
• Good protection for agricultural engine
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Specifications / Performance; Specifications / Performance
API CF-4/CF/SG
ACEA E2/B2
MB 228.1
MAN M3275
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Storage; Storage
All packages should be stored under cover. Where outside storage is unavoidable drums should be laid horizontally to avoid the possible ingress of water and the obliteration of drum markings. Products should not be stored above 60°C, exposed to hot sun or freezing conditions.
; All packages should be stored under cover. Where outside storage is unavoidable drums should be laid horizontally to avoid the possible ingress of water and the obliteration of drum markings. Products should not be stored above 60°C, exposed to hot sun or freezing conditions.
;
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Health, Safety and Environment; Health, Safety and Environment
Health, safety and environmental information is provided for this product in the Materials Safety Data Sheet. This gives details of potential hazards, precautions and First Aid measures, together with environmental effects and disposal of used products. ; Health, safety and environmental information is provided for this product in the Materials Safety Data Sheet. This gives details of potential hazards, precautions and First Aid measures, together with environmental effects and disposal of used products.
Castrol (UK) Ltd. or its subsidiaries will not accept liability if the product is used other than in the manner or with the precautions or for the purpose/s specified. Before the product is used other than as directed, advice should be obtained from the local Castrol office.; Castrol (UK) Ltd. or its subsidiaries will not accept liability if the product is used other than in the manner or with the precautions or for the purpose/s specified. Before the product is used other than as directed, advice should be obtained from the local Castrol office.
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Typical Characteristics ; Typical Characteristics
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Test Methods; Test Methods Units; Units Value: ; Value:
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SAE 15W-40
Density at 15ºC ISO 3675 / ASTM D1298 g/cm3 0.885
Viscosity at 40ºC ISO 3104 / ASTM D445 mm2/s 112
Viscosity at 100ºC ISO 3104 / ASTM D445 mm2/s 14.7
Viscosity Index ISO 2909 / ASTM D2270 - 135
CCS -20ºC ASTM D5293 mPa.s 6700
Base Number ASTM D2896 mgKOH/g 9.7
Flash Point (COC) ISO 2592 / ASTM D92 0C 230
Pour Point ISO 3016 / ASTM D97 0C -36
Sulphated Ash ISO 3687 / ASTM D874 %m 1.3