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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: best oil
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Fri, 22 July 2005 13:55
 
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best oil is one that stays clean and doesn't burn...
the hot viscosity of any of the 50 weight oils will be the same at operating temp.. i did find that mobil 1 5W50 idn't like being wayy overheated, and did get thinner faster than other oils, but within normal human temp ranges, it was fine.. the 5W is great for when it is cold... oil is at the bearings when you need it etc...
i found mobil 1 to be the most resistant to burning but only out of valvoline, mobil, shell, castrol and penrite products (synth, semi, and mineral).. didn't try many others..
so.. basically... if your oil pressure gauge shows that you are not losing enough pressure to be damaging at idle at operating temp, then the oil is thick enough to keep pressur eup.. that is not a great indicator of how the oil film performs at speed, but it's one way to weed some oils out 
my pick would be something between 10W50 and 15W60... the low number depends on temps the weather gets. the hot number depends on how hot your motor gets.. for turbo, thicker is better because it thins out when inside the turbo from the extra heat (perhaps)
go on Toobs, you know you wanna talk brands which would be your pick out of the 10W60 and the 15W50? (10/60 sounds interesting..)
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