NO. 403 is an Oldsmobile engine 400 is Pontiac engine no it dows not i have a Pontiac 400. uses diff. parts not interchangeable.403 is Oldsmobile
it shouldn't use any
You can use 10W30 or 20w50.
use synthetic every 7500.
4 Liters if you use a standard recommended oil filter.
Pontiac oil pressure can be tricky! Check with your mechanic first but from my experience with my Pontiac use 10w-40 oil in the winter and 20w-50 in the summer. That has produced better pressure in mine.
no. you can use any oil in the engine. But only use GM supercharger oil for the supercharger.
I use 10W-30
you probibly need to change the water pump to a newer year. there is no difference between the 400 and the 455 besides the year. if you use the pump for the 455 it should work or go to the salvage yard and get pully setup for the 455.
For the Honda CBR 400 basic oil is used for the motor. You can purchase the oil at a local auto parts store such as auto zone.
The Polaris 400 Sport can use any as a be certified motor oil. The manufacturer recommends a 10W-30 motor oil.
5w30