Happy spring from the east. I have this ciera w/ the gm 3.3l. I think it has sludge as 4 qts fills it full. I used maxlife 5w30 and 1/2 qt Mmo. Ran that for 1500 miles then changed out. Cut open the oil filter and let it dry and to my surprise it had very fine grit in over 1/2 the folds. Awesome! Means it is dirty. So I was in walmart in the oil section and looking at the oil I see rotella 15w40 diesel oil cf4 stuff. I'm thinking I'm going to put 1 and 1/2 qts Mmo and still would like a semi thick oil so the "friction" maybe works at the sludge a little more. Now at the same time it also has a cold start up tick. Thinkin this would be better protection and maybe it would not tick as much. First thing I noticed when I was pouring the 2.5 or so qts was the whole valve cover filled up. This stuff is thick! After that drained down, put I the 1.5 qts Mmo and gave a start up. Sounds no different. Same slight tick. Alright but it does feel smoother at idle. Maybe because the friction of the thick oil, making the engine work harder? Take it out for a ride and it does seem quite, like it has thick oil. It's slower. And feels as if it has 300 more lbs. So I keep this stuff for the a oci of 2500 - 3 then change it back to maxlife 10w30? What was I thinking. Lol.
