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Low oil pressure! Help!
i have a problem with my engine, hope you guys can give some solutions or suggestions.
Here's the situation:
When my engine is warmed up (after half an hour's ride), the oil pressure will drop to less than 10psi and the warning light on my oil pressure gauge lit up. However, when i am driving, or as long as i step on the gas, the pressure will go up to 30psi or more. This only happens when the car is warmed up. Otherwise, the oil pressure is between 30-60psi. Also, i notice there is some slight knocking sound coming out from the valve cover, on the timing belt side when the oil pressure drops below 10psi. Sometimes, when i clutches in to down-shift, the oil pressure will drop together with the rpm. I could smell engine oil when the engine is started up, probably came from the exhaust, but did not see any blue smoke out from it.
Prior to this, i found a bad PCV valve (wouldn't rattle) and had it replaced, and did an oil,spark plugs and oil filter change after that. The throttle body was cleaned on the same day too.
Now the question is, what could be the cause of low oil pressure on hot idle? Is there a possibility that fuel has entered the engine and caused damaged because of the bad PCV valve? Before the oil and PCV valve change, the oil pressure appeared to be more than 15psi (still low?). Some research on the web suggests replacing engine bearings as it might be worn. Will this solve the whole problem or do i have to re-build the whole engine?
Is it ok to continue driving it as long as i minimise the need to idle when hot?
My current mileage is 290500km and running 4A-FE with 0W40 Mobil 1 engine oil.
Any help will be appreciated. Thanks in advance!
Last edited by technica; 05-14-2008 at 04:35 AM.