this question is about the dipstick in a 4.2 jag motor 258cuin , the prsent stick is 21an 3/4 inchlong has markings on tip 340/4.2 is this the right one,it says 5 qts of oil is overfull but the motor should take 2or3 qts more, does any body know ??? i was thinking of buying a used one that fit on line but i dont know if that would be good or not. thanks for your help .