Originally Posted by LynMarStat
New member here. I have a 2015 Nissan Murano that has sludge in the engine. It only have 51,000 miles. And yes, I changed the oil.... At every start up, I get BIG puffs of white smoke. I really like Nissan, as this is my second Nissan vehicle, but this sludge issue is changing my mind. Has anyone else had or have this problem. Everyone tells me to trade it in. Nissan says I need a new engine. Any suggestions or fix?
Are you getting white smoke only at startup? If so, then it's probably water vapor which may be caused by a blown head gasket or a crack in the head casting from the water chamber to the combustion chamber. Perform a compression test on all cylinder and then if you find a suspect cylinder, follow it up with a leak-down test which will pretty much nail down the actual defect spot.
However if the smoke is blue in color and is always there, then that's an indication of oil burning. A good way to test for oil burning is to first fully warm up the engine. Stand behind the car. Have someone rev the engine to around 4,000 RPM and hold at that RPM for about 15 seconds. If you see a lot of blue smoke come out of the tailpipe, the engine is burning excessive oil. If it's black smoke, then it may be leaking fuel injectors.
If it turns out to be ether a blown head gasket or a cracked head, the expense of that fix is considerably less then a total engine replacement.
If you plan to de-sludge the engine, step #1
- manually clean out the valve chamber area that's under the valve cover. Step #2
- drop the oil pan and clean out any sludge there; remove the oil pickup screen and clean it. Be real careful when using any sludge remover; run engine for some short period of time, then drain oil and replace oil filter; do this at least 5 times. Just use some cheap oil and filter when doing the cleaning. If you don't go through the drain/replacement cycling like I suggested, you could end up with a lot of loose sludge that could plug up some critical oil galleries and cause engine damage.