hello all, i have a mazda 6. 2004 with 3.0 5 speed. 148,000 on the clock. while back had loud clattering noise from motor. did the sea foam crap with no resuts. did the marval oil additive and after few miles quies as a mouse. 3000 miles later i get this loud ticking on top of motor, under valve covers. started using oil rapidly! changed oil and added marval oil additive again, and ticking has stopped but 1 quart every 50 miles and smokes like the devil!!! ideling or driving! 3 pvc valves, new pvc line... no change. oil on #6 plug. pistion is wet and shiny clean!!! did comp test on front 3. hot motor i got 118, 120, (126 on plug with oil) what is going on? no skipping or surging. to a blind man he would never know anything was wrong. hel
Update.... just did compression test on motor cold. All 3 cylinders hit 124. #4 plug no oil, #5 no oil, # 6 oil. But all 3 read the same psi.
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Back in 2009 I had a compression test done on my 2006 V6 3.0 Mazda 6 and my values were 190. To me your values seem low. I would phone your local Mazda dealer service department and ask them what acceptable values are for your year of car. With that mileage and all that burning oil, your catalytic converters may be plugged. Plugged catalytic converters can cause pressure to back track to your engine causing severe damage. Mazda recommends changing the catalytic converters after 100,000 miles. http://www.villa-automotive.com/Reas...terFailure.htm (see the part on Oil entering).
You could have oil passing by the piston rings and/or the valve seals. The prognosis does not sound good. Please phone your local Mazda dealer for verification.
You will have to drain them every trip (with your stats).
__________________ 2006 Mazda 6, 3.0-V6, 6 Speed ATX, 61000 km MODS:24mm Progess Rear Sway, 1.5" Drop Front, LED int lights, K&N SRI to CAI with engine baffle, Steeda 1/2 Spacer, Battery insulated, Solar Panel, Pre-Cat Back Custom Exhaust to 2.5"Magnaflow Main Cat, MazdaSpeed Cat Back, 2V Hi Voltage Ign Coils, Water Shield, HiD Low Beams, 2 15" Subs, Extra Grounds, External Tranny Cooler, Tinted Windows, 180 T-Stat, Lucas Engine Oil, B&G Tranny Oil, Cut Throttle Shaft, Chrome Strips
Last edited by UseYourNoggin; 05-03-2012 at 08:39 AM.