brmurph Posted May 24, 2008 Report Share Posted May 24, 2008 I had to replace my blower motor so while I had easy access to the plugs I went ahead and did a compression check. Turns out it was a better idea then I thought as I had two loose spark plugs, loose enough that the plugs were black compared to the others but tight enough that they did not blow out (less then a turn or so loose). The reason I did the compression test is because I am now burning a quart of oil every 800 miles (this motor has always consumed oil but I use to get at least 2300 miles per quart). Not sure but it seems I really started going through oil when the dealer installed timecerts for blown head gasket at about 99300 miles, I now have about 135000 miles. Anyway the lowest pressure after 5 cranks was 180 and the highest was 188 which I thought was outstanding at this mileage. Also the first crank pressure was a low of 107 and a high of 118 (not sure exactly what this says but I have heard its good to check :-). So my question is how useful is this info for oil consumption? Seems odd that I am going through so much oil with such good compression. Could the oil rings be gummed up yet compression is still good? I have been on this board for a while (all the way back to Guru) so I understand the WOT procedure and do it often but consumption continues to get worse. Any chance the loose plugs caused some of the oil consumption? I did have an oil anaylisis done last oil change and the only thing they found that was odd is he said the oil was equivalant to 20 weight oil, I use havaline 10w30 so this made little sense to me but maybe that is the reason for the consumption. Thoughts? Link to comment Share on other sites More sharing options...
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