I use 5w 30. Synthetic. NAPA
replace your struts and use nice tires like the michelin energy mxv4 s8 for your 17" wheels
5w30
You can use it in all cars
Yes, you can even mix synthetic with conventional oil.
5w30 synthetic. 5 quarts.
Any oil that cost 3 dollars or more a quart
A 1999 Q45 takes 6 quarts of oil (with a new filter).
Well I don't know what oil, comes stock in the Infiniti. But I do know that you can use any type of oil for the Infiniti just like any other rig. Preferred Royal Purple and Castrol Syntec or EDGE.
Yes, I have been using 87 octane for 4 years without any negative effects. I have no valve knock. In fact, my highway milage is about 27 mpg at 75 mph. Modern auto computers do the trick.
I have been running Castrol Syntec 20w50 in my Altima for 15 years, and have not had an oil related problem. The car has 230K miles on it.
Read your owners manual. It will show you where your oil cap is and it will tell you what kind of oil to use...among other things about normal maintenance for your vehicle.