ive always been told it is not good to overfill a motor with oil as it may blow out the seals....not sure if that ACTUALLY is true but then ive never lost oil pressure in a vehicle with the proper amount in the pan
Thats right the 304 360 390 401 all use 5 quarts of oil, and only the ones with a special built oil pan will take 6. You risk issues with more than 5 in stock style pans.
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but I've heard that those in the know put in six to keep the sump from going dry.
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Well they know ,,,WHAT,,, I don't know, but if the oil level is to high the crank will be hitting the oil on unlevel ground. Also an extra quart of oil may not keep you from dry sumping on steep inclines. You will need a special baffle and pick up in the pan to keep from doing this. That is what the big boys use and most wheelers don't go to that expense. I would not run more than 5 quarts in a stock motor, he he, unless it requires more, the 258.
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