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The Haynes manual says API grade SE or SF 10/40. I am ok with 10/40 but not sure what API grade SE or SF means, so any clarification is appreciated. Should I be using a semi synthetic oil? as oils have improved since my wing was made in 1985. I am in the UK and temperatures range typically -5c in winter to +30 in summer, average is 10c to 25c.
Daveski
 

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i head to autozone for some castrol t4 10w 40
 
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