Since the big ugly engine burns Jet A and not leaded AvGas my choice is Mobil 1
5w30 SN 100% synthetic... not because Mobil sells 85% of the market
share of oil rather its readily available for a good price at the
major chains such as Walmart...
Synthetic or Mineral???
Both Mobil synthetic and non synthetic begin with good old crude
oil... synthetic molecules are made in an extra and expensive level of
refining that produces the highly desired low drag uniform
molecules... compare that with the straight mineral oils undesirable
varying size and high drag molecules... uniform synthetic molecules
flow better than varying size mineral molecules... synthetic oil is
like flying through smooth air where as mineral oil is like flying
through rough air... which one is most desirable for you???
Whats the difference between 5w and 10w???
API ranks the first number 5 and the letter W from the oldest to the
newest on its ability to lube your engine during critical start up
where the most wear happens before warm uo...
If you wish to employ the latest in oil technology then you want an one with
an API rank of 0w or close to it...
30 or 40 Grade
Oil drag is real and it will cost you HP... choosing a
30 grade over a 40 grade is smarter because it will:
1)increase HP at the prop...
2)quicken the flow during start up...
3)decrease over all operating temps...
4)increase the oil flow at the critical bearings...
Oil drag in a tube comparison