I am using Bardahl FS engine oil 5w/40 and along the way, the engine oil star decreasing, almost more than half of the dip stick mark.
Foreman say that the oil might not be suitable and I have to use 10w/40 instead. Any comment?

bro mine nearing 15 years. still no oil consumption and using 5w30 till now.
could it be other problem?

no engine oil leak, what could be the problem?

bro better go and do proper diagnostic.

https://www.firestonecompleteautocare.com/b...-without-leaks/ , google may not be accurate.

You can start with finding another better mechanic. What this one spew was utter bullshit.

- Rev your engine and see if there is blue smoke coming out of your exhaust.
- Check your coolant if there is any oil mixed in it.
- Check for oil stains around your engine, especially around the valve cover gasket and cylinder head gasket.

This post has been edited by dares: Aug 16 2022, 12:39 AM

sigh! This sound serious! Although i found this to sound like my foreman form the above link "For newer engines that use low-viscosity oil, such as 5W-20, even small amounts of wear can lead to oil entering this chamber"

This post has been edited by gedebe: Aug 16 2022, 01:03 AM

Does your exhaust tail pipe come out blue smoke? If yes, then piston ring worn already.
If no, then its leaking somewhere.

I agree with dares ,please change your foreman. He is an idiot to spew BS to suggest changing from 5w40 to 10W40.
No difference when engine is hot. Only when cold, engine oil is thicker abit.

Its normal for engine to consume some oil, especially in this case of it being an older one with many other factors which we dont know like mileage, style of driving, etc.

How much KM travelled vs reduction is unknown.

Example the 1zzfe is infamous for having this issue (google it, class action lawsuit in US), yes, using heavier oil may slow down the consumption issue, but the core of the problem still needs to be identified/rectified, if the cost of repair can be justified.

Your mechanic is suggesting a troubleshooting step, which is a simpler one.

I've own 1zzfe with oil consumption issue, and many others who have this engine experience same be in an Altis, Wish, Rav4, etc etc. However there are no smoke from exhaust, or oil in the coolant. It is just the unfortunate design of the first gen 1zzfe, where the oil is slowly burned during the combustion cycle.

Most likely you changed your oil always a little too late and have clogged up the piston ring's oil flow channel. Thus, your piston rings are fried. Most likely a top overhaul to replace new piston rings and seals are needed.

Toyota engines are prone to this issue. Change your oil early and don't stick to the 10k km for FS.

yes indeed, i always service my car late some even near to 20k, is a top overhaul involve a lot of works and costly?

This post has been edited by gedebe: Aug 16 2022, 12:32 PM

There is no need to do top overhaul, for now.

If your exhaust is blueish in colour (which is quite hard to determine, even by experienced car drivers or some mechanics) then the engine is not leaking engine oil , but is consuming engine oil.

Next is to check/determine whether engine oil consumption problem is caused by:
a) hardened (exhaust) valve seals and/or
b) clogged piston rings.
In either case, there is remedies in a 10 year old Toyota engine.

This post has been edited by zeng: Aug 16 2022, 01:54 PM

Those days, a top overhaul might cost around rm1.5k.

Now it may cost more due to inflation. Top overhaul is fairly easy as you only need to remove the engine head and replace worn parts at the top engine area.

rm1.5k is already very expensive to me, does it includes part?

Suggest you to get direct quotation from a few workshops to better guage the overall price + parts.

This is the consequences of not taking car of the car. The repair amount needed will be huge.

i din know missing servicing can caused so much damage, even a Proton if you delay servicing won't!

@TS how you measure oil level? Engine cold, and parked on flat surface?
Do you change oil brands regularly?

To verify if engine is consuming oil (and not leaking away), check the spark plug, and see if any of it has signs of black soot around the tip. Change to other brands of oil, or those that you have used before.

Few possibilities with oil consumption, valve seal leak or worn piston rings.
Oil leak is another issue but mostly can determine from external inspection, or look at radiator coolant.

Some foreman will do what they can to save your money, meaning top overhaul with necessary works only - repolish block and new piston rings. Ask around.

You should read TS's practice. He can prolong the service beyond 10,000km and up to 20,000km.

You might escape it doing it once or twice, but if you constantly does that, engine problem will come later. That is, for cars beyond 8 years old.

by the time half dipstick. go oil change new again.
dont have to worry

Dear ts, u prolong to 20k for oil change really messed up your engine. Whether the damage is already too much or not we do not know unless we test it.

If u dont want to spend any more money on it..u can put a bandage... Everytime pour in lucas oil stabilizer into your engine during new oil change.

Follow below steps if u want to save money + help your engine.
1. Go mechanic and do dry compression test for all your cylinders are good. If still good, proceed to step 2. If no good, u will have to do full engine overhaul because your cylinder walls already almost certain full of deep scratches and grooves. Full overhaul for damage like this includes rebore cylinder walls and putting in bigger newer pistons. Rm5k and above easily.

2. Take boroscope and look down into cylinder walls. If no deep scratchs on cylinder walls, proceed step 3

3. Buy engine flush or cleaners like marvel mystery oil, lucas complete engine treatment, etc. It is a aggresive cleaner. Follow the instructions. Not 100% but hopefully this will slowly clear the gunk around your pistons and free up all your rings and also oil passages that has been blocked. If oil consumption reduced, u can try again. If no reduce, go step 4.

4. Open up and pour marvel mystery oil directly into pistons through spark plug passage way. Wait few hours, manually turn the engine a bit, then pour again and wait another few hours. This way is very very aggresive in case step 3 does not work. See youtube to get what im saying or find a mechanic to help you.

This post has been edited by Balanced: Aug 16 2022, 06:49 PM

... you mean sometimes 20k KM only change engine oil?

This post has been edited by Quang1819: Aug 16 2022, 08:58 PM