Show PROPER OIL OIL IS ISI ENGINE NE NEED D I Draining Draining and Refilling of Crankcase Lessen I Troubles It Is not always apparent how the use uso u o of or the correct ol 01 In your engine will lesson your wo wok OT wok or k-or how bow a strict uP un on crank crank- case ease ase draining and r ln every overy miles will lessen the burden for you 1 But Dut lets let's see a moment Sup Sup- Suppose SUPpose pose aup-pose I pose sour our engine Is one ones ot of o the tho many which because or tit tit- Its sign il le sign Its construction and its lt ReI- ReI ser service vice sico Ice demands the use of it ft light ll U ht bodied medIum bodied oil of or in cle-in burn burn- burning burning ing character If In such an engine you were prompted or Influenced to use a 1 bodied heay heasy oil you would sonn find your dally daily labor labori greatly tn- tn increased In Increased I creased First doubtless you would nG 1 no- no notice no notice tice a 1 tendency on the part rt ot of the tho engine to miss YOU 1011 i would find find it necessary to change spark plugs and clean the plus plu smore more frequently than when the propel oil is used used-or used or else to drive e with a missing cylinder which In itself represents considerable work You Bonder onder why Simple sery ery In any engine tho tha oil I which passes Into the combustion I chamber must be bo not burned burned e but but burned Ilka like fuel or else It w ll stew down b gummy like molasses and form in abundance Now each oil has lIas a critical tem tem- temperature cem- cem temperature above which It will burn burnot ot off clean leasing lea scant deposit belo below which It will stew and gum and carbonize And while chilo few people e c e pt tn- tn en engineers n- n who ho have studied the tho problem lem iem intensively realize It ho he corn com com combustion bustion chamber of oC different engines ary sary widely I de-I do do pending on the tho service or loading of the engine the he method of ot COol 1 cool cool- cooling cool cooling ing the tho salve alve arrangement and other features of or design So when we put a y hel heavy heavy-bod burn to hard burn oil Into an engine with moderate or lo low combustion chamber temperature It Is not to tl tobo tobo bo be wondered at when the oil short circuits the thu plug gaps I there gaps gaps there hero Is la not heat beat enough to burn It off oct oft Automobile Digest |