just been having some dramas with our rolla, maybe someone has some input for me...number 1 cylinder isnt firing all the time, weird but seems ok when cold.lead seems good, plug is nice colour not wet and fouled,which is what i was expecting. everything seems kinda ok.so just did a compression test on no 1 its telling me 150, pretty good to me ? so now I'm going to check my clearences, but could this be bent rod maybe or would i be able to hear that. will thicker oil bump the compression up a little, oil is old.