- Joined
- Dec 28, 2011
- Messages
- 5,053
Talking about 2006 Nissan Sentra 1.8
Bought it with 159k for $500 and needing some basic love. Front and rear struts, plugs, drain/fill coolant, drain/fill manual trans, PCV, clutch fluid, and check engine light was on. Gas mileage was about 18 MPG IIRC. Had a code for bank 1 upstream O2. Replaced the O2 and mileage went up to 31/35 where it should be. I have about 6k miles on this and reported some oil burning. Previous owner is a good friend and he had done dino 10-30 at 3-5k OCI. He stated no oil burning issues. We are pretty close and he isn't one to lie or BS. I found it odd. After replacing the O2 and resetitng the check engine light returned with the same bank 1 fault.
I could hear an exhaust leak but figured I'd get to that eventually. Fast forward....I brought it to a friends shop and he found a rusted out bracket that caused a hole in the exhaust just before the downstream O2 sensor. He sleeved the hole and seems to be all good. We pulled the bank 1 O2 and it was heavily sooted. The oil was very dark for a well kept engine and smelled like gas.
Am I likely correct to believe that the hole in the exhaust just before the downstream O2 caused the engine to run rich and fuel dilution of the oil? The check engine light has remained off since sleeving the exhaust. The sump on the 1.8 is so minimal so I figured it a good idea to dump the 5-30 ST and put fresh oil in. Time will tell if it ends the burning.
Before the exhaust sleeve, I added 1 quart over 1700 miles.
I figure I'll run this OCI a little over 3k and send a sample to one of the lower cost UOA labs just to see what comes back.
Bought it with 159k for $500 and needing some basic love. Front and rear struts, plugs, drain/fill coolant, drain/fill manual trans, PCV, clutch fluid, and check engine light was on. Gas mileage was about 18 MPG IIRC. Had a code for bank 1 upstream O2. Replaced the O2 and mileage went up to 31/35 where it should be. I have about 6k miles on this and reported some oil burning. Previous owner is a good friend and he had done dino 10-30 at 3-5k OCI. He stated no oil burning issues. We are pretty close and he isn't one to lie or BS. I found it odd. After replacing the O2 and resetitng the check engine light returned with the same bank 1 fault.
I could hear an exhaust leak but figured I'd get to that eventually. Fast forward....I brought it to a friends shop and he found a rusted out bracket that caused a hole in the exhaust just before the downstream O2 sensor. He sleeved the hole and seems to be all good. We pulled the bank 1 O2 and it was heavily sooted. The oil was very dark for a well kept engine and smelled like gas.
Am I likely correct to believe that the hole in the exhaust just before the downstream O2 caused the engine to run rich and fuel dilution of the oil? The check engine light has remained off since sleeving the exhaust. The sump on the 1.8 is so minimal so I figured it a good idea to dump the 5-30 ST and put fresh oil in. Time will tell if it ends the burning.
Before the exhaust sleeve, I added 1 quart over 1700 miles.
I figure I'll run this OCI a little over 3k and send a sample to one of the lower cost UOA labs just to see what comes back.