totaly agree 100% modern fully synthetic oils are used in the most expensive engines in the world many revving up to 10,11 12,000. millions of �'s spent in developing modern oil .
honda gx160 is a single cylinder 160cc agricultural engine revving up to about 5,800 revs . a fully synthetic 5/30 or 5/40 will be more than adequate doesnt even have to be an expensive brand, they all have the same spec .
cool power is super thin and supposed to let engine rev freely, and of corse they are telling us that this is essential and it must be changed everytime out why do you think that is? �����
would be interesting to know if engines on cool power are revving any higer than others, are they running more freely ? this is interesting and often discussed,
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