15-30W Engine oil? for 150,000k's?

So burning oil does not have anything to do with Piston ring being loose / Worn? - only the PVC valve?

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Originally Posted by ricki_kalsi

So burning oil does not have anything to do with Piston ring being loose / Worn? - only the PVC valve?

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It does have to do with the piston ring and bores with worn. What happens is that the combustion gases at high pressure pass between the piston ring and wall (called blowby) and get into the crankcase. The combustion gas causes the crankcase to have higher pressure, which then is released by the PCV valve back into the intake manifold. If you have this problem, then usually the pressure is enough to cause even a new PCV valve to open. So in this situation, replacing the PCV valve won't solve the entire problem, but can help partially.

The amount of oil burnt depends on the amount of gas being released by the PCV into the intake manifold and that in turn is affected by a weak/worn PCV valve spring and worn piston rings and bores.

man your awsome... thanks for the explanation. :D

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Originally Posted by aaronng

It does have to do with the piston ring and bores with worn. What happens is that the combustion gases at high pressure pass between the piston ring and wall (called blowby) and get into the crankcase. The combustion gas causes the crankcase to have higher pressure, which then is released by the PCV valve back into the intake manifold. If you have this problem, then usually the pressure is enough to cause even a new PCV valve to open. So in this situation, replacing the PCV valve won't solve the entire problem, but can help partially.

The amount of oil burnt depends on the amount of gas being released by the PCV into the intake manifold and that in turn is affected by a weak/worn PCV valve spring and worn piston rings and bores.

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great explanation, mine burns oil quite quick, im using 0w-40 mobil1 gold (only cos i needed oil real bad but its not bad doesnt burn that badly) since my car done like 180,000kms i mite actually replace PCV valve regardless of it being worn or not (after 180,000kms, i think it would have worn weakened in some way or another) and im gonna go bak to my mobil1 silver 5w-50 .. not too concerned bout the .01kw in my car depending on oil, i cant realli feel a difference anyway, as long as i get enuff protection in my old engine and it run fine, salll gooodddd .. my car is a Civic VtiR btw

sorry wheres the PCV can someone get a Picture of an engine bay and Circle it with Paint or something? Thanks.

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Originally Posted by Kiz_EG6

I disagree with a 40 weight, the oil recommendation in the manual states 5w30 for climate temp under 30 degrees and a 10w40 for 30 plus.

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In Melbourne, thinking back in the summer with 2 consecutive 40 degree days, wonder how many Hondas on the roads got their FEO 10W-30 oil thinned out and sheared...:wave:

http://www.harleyc.com/prelude/faq/imgs/pcv.gif
for the guy who wants to know where PCV is...

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Originally Posted by slidetaker

In Melbourne, thinking back in the summer with 2 consecutive 40 degree days, wonder how many Hondas on the roads got their FEO 10W-30 oil thinned out and sheared...:wave:

http://www.harleyc.com/prelude/faq/imgs/pcv.gif
for the guy who wants to know where PCV is...

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Lets just say, i thought it was getting cold and it needed a change, so i changed it, then we had that LOVELY week long heat wave, so i was VERY gentle when i did have to drive her, the oil was probably like water!!

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Originally Posted by Kiz_EG6

.... the oil was probably like water!!

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won't be as severe as turning into water..

Somebody correct me if I got it wrong...but I think SAE ?W-30 are suitable for under 38 degree ambient temperature???

Then again, it depends on more things such as the conditions of the engine and its oil to start off with, how efficient is the cooling system working and what load the engine is under too...