Toyota Avalon Problem Report
Toyota Avalon Excess Engine Oil Consumption
Sludge can build up in the engine because Toyota did not recommend frequent enough oil changes. Lexus will sometimes offer a discount on cleaning the engine if necessary. Owners who changed their oil every 3,000 miles did not experience these problems. This sludge build up can lead to excessive oil consumption.
sludge in engine.
change oil 3/5000 miles.
not fixed. - Visitor
Have had problems since I bought the used car. interesting that others have experienced the same problem. Will check on these sights before buying my next vehicle. Brought this up to dealerships repeatedly. Have gone through numerous (at least 5) PVC valves! - Visitor
Car was to the point of oil contaminating the exhaust system at about 135K miles. Previous owner didn't change the oil frequently enough and this all resulted in top of motor replacement. Sludge cleaned out now (i hope) and it no longer smokes profusely like it used to. - Visitor
Only cleaner I found that worked (I tried 5 of them) was Auto Rx. follow the instructions completely. - Visitor
Sludge accumulated on the underside of the valve covers in spite of scheduled Mobile 1 oil and filter changes every 4,000 miles (Mobile recommends every 7,000 miles). Don't know if the oil was the problem or moisture condensation/oil mix (after engine shutdown)caused the sludge. However sludge eventually got into the valve guide seals and caused heavy oil consumption (1 quart ever 100 miles) which ruined a catalytic converter. Cost of the fix ? Toyota dealer charged $3,416. No idea if it will happen again. Changed to total synthetic Amsoil 5-20 and Amsoil filter. Love the car but thinking about installing a small block Chevy and converting to rear wheel drive (did that to a Nissan Altima). - Visitor
Oil was being blown out the exhaust (white smoke) making it look like it was coolant but the oil was leaking rapidly, not coolant at all. The entire engine had to be cleaned out due to sludge buildup and I am only going to run synthetic oil from now on to avoid the problem again. - Visitor
Just started useing oil very bad. I took off front valve cover and holes in head was stoped up.. I could not get the back cover off. This is a very good and clean car..Help.... - douggramps
sludge stopping up the PCV system causing blown valve cover gaskets and engine had to be cleaned and flushed with valve cover gasket replacement. - Visitor
just bought used 2001Avalon.havent had2wks&check engine lite came on.Reads Code PO446!its blowi...
the last oil change I did on my car I used Mobil 1 5w 30 high mileage full synthetic and had no...
will changing to synthetic oil cause oil to get into radiator?
An engine oil leak may develop from one or both valve cover gaskets, especially the one near th...
The engine mount on the passenger side of the car can wear out on cars with high mileage. This...