Some time ago I'd collected 8-10 dipsticks from various S30 and S31 engines. At the time I noticed there were three different lengths, measured from the bottom of the rubber stopper to the tip of the dipstick. I have two dipsticks currently that differ in length by 3/8". Does anybody know which sticks are for which block? Theoretically, the amount of oil in an engine could be off by 3/8," potentially translating to being  1/2 to a full quart different. I'm currently running the short dipstick fr