I think it is. My Buick 3800 has 5 holes on the dipstick between the ADD line and the FULL line. The other day, only 4 holes were covered up with oil. So mathematically, I'd have to add 6.4 ounces to get the 5th hole covered up. The heck with that, in a another full quart it went. So now I'm probably a little less than a full quart overfilled. I've noticed NO difference in the way the car acts. Fuel mileage is the exact same 18.7mpg that it's always been.
Acceleration is the same as before too. No sluggishness to report. The only difference is maybe a slight improvement in smoothness, but I don't see how an extra quart is gonna do that. Most guys would just simply wait until the oil is down to the ADD line before adding the other quart, but I can't do that. I gotta have plenty of oil in the engine for piece of mind.
I don't think the Buick engine is the only engine out there unaffected by the extra quart. I think there's plenty of other engines out there that would be unaffected too. Maybe even some of those fragile Hondas.
Acceleration is the same as before too. No sluggishness to report. The only difference is maybe a slight improvement in smoothness, but I don't see how an extra quart is gonna do that. Most guys would just simply wait until the oil is down to the ADD line before adding the other quart, but I can't do that. I gotta have plenty of oil in the engine for piece of mind.
I don't think the Buick engine is the only engine out there unaffected by the extra quart. I think there's plenty of other engines out there that would be unaffected too. Maybe even some of those fragile Hondas.