Whats up guys? Need some advice on engine oil for my car:
- almost 20 years car
- 60k mileage
- very seldom use, yearly maybe 1-2k only now
- jap car
- no plan to sell (personal reasons)

Currently my oil change is based on mileage instead of duration, using semi synthetic oil. Is it better to use fully synthetic for better protection since I seldom use it? Was thinking if fully will be better in the long run, then no harm putting it in.

And any issues if i didn't change the engine oil for 2-3 years since the car hardly move.

MINUMLAH BOLD

old car better goes for semi syntectic or mineral oil. mineral oil sticks longer to the engine component than full syntectic. downside is performance are not as great

Wts castrol 15w40 cheap cheap

Start car once every few days to coat the engine is already good enough to protect. No need think so much.

Must use full synthetic then. 5W40. Too thin cannot

If use minerals type sure KO

Nope. Mineral oil will degrade after 6 months.

never own a car age > 7 years...

not able to advice...

I always used fully syn for all my cars . When got leak gasket for my older car when change open head very clear no disgusting crud. On the internals. What this translate is less wear . For older cars standard 5w 40 is good enough but if you want better fuel then 5w 30 my opinion la. 5w 40 give better protection at higher temp and 5w 30 is lighter so engine can move freely. I might be wrong but no harm to try. Downside with 40 is worse FC but better protection and cheaper . 30 is better FC but more expensive and if very hot temp not as great as 40.

Semi synthetic from what I heard if u change frequently 10w 40 every 5k should be ok but I won't la.

This post has been edited by lordgamer3: Jun 8 2025, 04:32 PM

use 5w-30, got money buy valvoline engine oil protect and restore, about rm230. good engine oil
start the car every few days

doesnt mean much if the car were seldom use.
i asked mechanic before i have 4 years old engine oil, should i use it? he say yeah you should, dont waste.
i think got youtube video test old engine oil that was stored in container vs fresh one, very little different in performance
but engine oil in the engine is already exposed to air everything, but yeah still better than well used oil with high millage on it.

My 20+ year old manual Kelisa on Full synthetic. Changes based on mileage (but atleast 1 time per year even my old timer mechanic say no need).

So far so good. Every year still my kawan neighbours ask me want to sell or not.
To be honest, when my everyday car masuk workshop, the kelisa really come in handy 😂

in reality most people that change oil less frequent have great used millage on the oil. last time i did oil change on my seldom use car, the mechanic literally want that oil to use on his car lel, still very yellow.

we are not sultan johor can tukar minyak every month lel. 1 year interval is totally fine for for seldom used car.

This post has been edited by zerorating: Jun 8 2025, 04:51 PM

The longest I had go is 18 months with fully syn oil. Mileage 3k per year. Just so drag another 6 months. Drive every week once or twice.

Gunalah bold engine oil!

Use fully synthetic la. Because semi synthetic meaning very lax...1% fully + 99 mineral also can considered as semi synthetic.

Change oil every 1 year or every 8k if using fully la, because oil also can oxidize if left too long even if very low mileage.

Use ori fully synthetic oil je. Cheap cheap. My bold engine oil fully only rm50 for 4L. Cheap yo.

but manufacturer said, manufacturer said.
of course la manufacturer give a safe quote. a person that said he seldom use his car can clock at 10000km millage in 6 month. yes addictive in engine oil might wear off, but its the oil that do the most when it come to the protection, not the addictive.

Yes but I dont feel any difference whether or not I had oil change. On my company car, yes, I can feel the difference after 7k or so mileage but on my wife car, cant feel any difference with just 3k mileage.

simple, dirty oil have sludges and sendiments that change the engine oil properties. making its lubricant capabilities less effective over time.

60k KM is nothing lah, low mileage
use back the same grade of oil only
any seal that's broken, just change those instead

Using 20 year old plotong
Meant to use 20w-50 mineral

Currently using cheapest fully syn 5w40 (bold atas)
No leaks cos replaced rear main seals/valve cover etc etc

Oil change every 8k km/6 months