So why do they use fully synthetic in car engines then?
Most car engines, do not have an integral gearbox, which is exceptionally hard on oils.
The main benefit is longer oil changes, so that servicing costs came down, and the ease to manufacturer oil to specific viscosity for specific engines ie 5W30 for the Mondeo.
In a high revving engine, and one designed to benefit from the advantages of synthetic it is worthwhile Honda claimed an extra 4bhp on the rcv with a dedicated oil.
Is it worthwhile on an air/oilhead; slightly, but the cost benefit ratio isn't.
For an LC or a Shift cam, which have integral gearboxs then the cost benefit is worthwhile.
When you consider how much an engine costs to replace compared to changing the oil/filter every 6K or 6 months it is far cheaper.
Main dealers are taking the piss with what they charge per litre, and their misleading claims, any oil to SAE SJ (for example) specification is just as good.
Also, it is easier/cheaper/more profitable for the dealers to stock just one oil. Does a 2009 hexhead require the same oil as a 2019 S1000rr, why would a main dealer do so ?
What was the specification listed in the owners manual for a 2009 hexhead, if the oil is such better quality, why has the service life not increased commensurately.
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