Was about to do an oil change on my New Holland LB75B backhoe to put in a lighter vicosity oil for Winter, but first wanted to know where or how to fill it with oil. Looked all over the engine, went to the repair and maintenance manual and cannot find anything that mentions how or where to refill the engine. I know it takes 3.7 gals and the correct type oil. So needless to say I backed off and am trying to find out how to put new oil in the engine. I have several other diesel engine machines (Yanmar, Komatsu) and have not run into this problem before. Looking for some direction and advice. Thanks.