Oldsmobile 307 V8 10w-30?

[HangerHarley]

Originally Posted By: 901Memphis
I wouldn't let a tv ad sway my purchase decision, i just think they are funny. I will buy the products that have the best prices or the best quality, period.


But what if it is the best product AND funniest ad? I dont see your argument as valid.

btw, the 1982 version of this engine -ROCKS!-

 

[Garak]

Originally Posted By: oldsmobill
Now here is the question: on an engine with this many miles on it, in Minnesota where it is currently 12 degrees in early December and likely to get much much colder, what is the best viscosity to use and should I change viscosities between seasons?


Another poster mentioned that your vehicle has a roller cam. I see no problem with what you're doing. We ran taxis that collectively accumulated miles in the millions (similar vintage to your car) running exclusively Quaker State conventional at 6,000 mile OCIs. Stick with what you're doing - it's worked for you already. You could choose a 5w30 or 0w30 if you really wanted, but your experience speaks for itself.