If the Mirage is multi port injection, 10k km is doable I suppose.
Though most would settle at 8k.

http://bobistheoilguy.com/putting-the-simp...into-viscosity/

a)From the link I provided above:

http://bobistheoilguy.com/putting-the-simp...into-viscosity/

b)The grades denoted with the letter “W” are intended for use in applications operating in low-temperature conditions , i.e the SAE requirements are as follows :-
0W for -40*C ambients engine starting;
5W for -35*C ambients engine starting;
10W for -30*C ambients engine starting;
15W for -25*C ambients engine starting;
20W for -20*C ambients engine starting;
25W for -15*C ambients engine starting;

c)In Malaysia, typical coldest temperature we encounter is 24*C or thereabout .
Therefore according to SAE, Malaysians don't need multigrade engines oils with ALL the cold temperature ratings of 0W;5W;10W;15W;20W and 25W.

d)Can we use xW then ?
Sure , we can.
Is it necessary ? No, it's not necessary.
We don't benefit from it's intended use of starting engine at ambients of -40*C to -15*C as our lowest ambient temperature is around 24*C in the early hours of the day.
Hence, according to SAE we require only monogrades, not multigrades.

e)On monogrades SAE 20 to SAE 60....., my rule of thumb on minimum engine starting cold temperatures are :
-10*C and above for SAE 20;
0*C and above for SAE 30;
10*C and above for SAE 40;
20*C and above for SAE 50 and
30*C and above for SAE 60.

f)Since our lowest ambient is 24*C (and basing on my rule of thumb above) , monograde SAE 50 would be the thickest grade allowable for engine starting in the early hours of the day.
Can we carry out engine starting here for SAE 20; 30 and 40, besides SAE 50 ?
........ Refer to (d) above.

g)So much for engine starting for 'cold' temperature regimes that is regulated by SAE/API.

h)Now, what oil viscosity grade OP should use in his Proton Saga ?
This ....... is none of the business of SAE/API!
OEM's calls the shot here.

IIRC for 4G13 and 4G15 engines , Proton(Mitsubishi) recommends from 10W30 ...... 10W40 ...... 15W40 ...... and 20W50.
I would see if I can provide a link ...............
JMHO

Edit:OP, does your engine come with carburretor or fuel injection system?

This post has been edited by zeng: Aug 23 2016, 02:43 PM

No, it's either or.
An engine with carburretter fuel system , doesn't have (electronic) fuel injection system ...... and vice versa.

Here is a link on Shell Helix Ultra 5W40 fullsyn UOA by a fellow Malaysian on an USA oils forum.
http://www.bobistheoilguy.com/forums/ubbth...opics/3986194/1

+1 , concur with therain01 in your context.

I abandoned Petronas Mach 5 SF/CC SAE 40 for Petronas Mach 5 SM/ACEA A3-B3 15W40 ..... as my Wira carburretor engine requires SG.

For the same price,I later upgraded the specs to minerals Urania Supremo CI-4/ A3B4/SL 15W40 (which basically is a Heavy Duty Engine Oil for diesel engines) till todate.

Now semi synthetics SL/A3B4 10W40 can be had during promo , at lower price than CI4/SL/A3B4 and begins to flow into the other multi-port injection Avanza.

I'd no success in securing locally a 20W50 with A3B4 specs ...... and don't have a need for it ..... as all 3 engnes are not leaking oils.

Since yours is a carburretor engine, I would recommend a mineral A3B4 15W40; or a semisyn A3B4 10W40.
If you so wish,and have budget for a fully synthetics 0/5W-40 A3B4, why not?

Just my 2 sen.

This post has been edited by zeng: Aug 23 2016, 02:31 PM

Foreigners are thirsting for Petronas Syntium 7000!
http://www.bobistheoilguy.com/forums/ubbth...z_A#Post4178404

Hi Alcyon,
there is another fellow Malaysian newly onboard Bitog yesterday.....
https://bobistheoilguy.com/forums/ubbthread...ion#Post4211084

Does this Pennzoil SAE 30 comes with ACEA A3/B4 specs ?
If yes, I would give it a try in mine ......as I believe a VII-free monograde is the way to go here.
Our weather doesn't really require multigrades ....
as it shears in engine operation depending on quality of Viscosity Index Improvers in use ......thus loosing viscosity,
no wonder my Wira 4G15 on 10W30 was consuming engine oils in those good old days.

This post has been edited by zeng: Sep 27 2016, 12:03 PM

Is it?
Against which brand of xW40?


Not sure if I understand your point here. Care to elaborate further?


That's very interesting.
Mind sharing the comparative readings on oil temp and pressures.

This post has been edited by zeng: Sep 29 2016, 03:48 PM

I'm getting 420-440 km on 15W40 A3B4 in carb' 4G15 ....... sigh..

Edit: It's HDEO diesel oil

This post has been edited by zeng: Sep 29 2016, 08:04 PM

Post #64 of this thread.

Lying ...., I speculate.