my manual for '82 seca 400 says "Periodic oil change: 2.2 liters / 2.3 us quart .... With oil filter replacement 2.5 liters / 2.6 us quart"
0,263 litre 10W30 oil
2
I have a 92 seca 2 with a 600cc motor, and it takes 2.6 quarts of oil to fill it up.
front or rear diffs take approximately 320cc. fill the diffs till the oil runs out the filler hole, it will find its own level.
The oil capacity for the Yamaha Big Bear 400 is 3.2 quarts. It is recommended you use 10w30 oil in the Big Bear.
You can use 10W30 or 20w50.
SAE 20W40 type SE motor oil for > 40deg F SAE 10W30 type SE motor oil for < 60deg F
I believe Yamaha came out with oil injection. You do not mix the oil with the gasoline - the oil is in its own reservoir and mixes automatically.
The Yamaha 400 Kodiak all terrain vehicle takes 2.6 liters of oil to fill to capacity the oil tank. That amount is approximately 2 and one thirds quarts of oil.
10w-40 is recommended
yamalube 10w30
20w50