Hi Guys.

Want to ask something, when we go to service center like Toyota, Honda and etc, they all tighten the undercarriage of the car, actually what they tighten ?

I feel alot different when driving, the car more stable and solid feel after service at those service center.

Now my car no more warranty, so i plan to service outside, but not sure how to tell the shop.

so direct meh, i think girl wo... (from forum profile la)

Hello all sifus, my just noticed that recently my civic 97' gear oil leaking, how should i fix it ? and how much will it cost? is it safe to drive with this condition now?  I need car for day to day work...
all sifus please advise.

No. That's why I asked.

I am exploring the possibilities.

There are people who don't follow the car manual.

Does your car manual says that your engine must use fully synthetic oil?

if amsoil 40k km EO still recommended 1 year change, your lm is in a much worse shape.

you want a sure answer, do a used oil analysis. else if you want to be on the safe side, change immediately.
remember, km or months WHICHEVER FIRST.

only after 20 months u posted this, i try the Polytron full synth eo 10w40 in my Y15ZR. and yes indeed, performance quite impressive. before this i use Liquimoly fullsyn. change every 3000km.
i heard that this Polytron claim can reach 10000km or a year.

saya seorang rider. penzoil, shell, caltex, motul, total, honda semua dh guna utk kapcai saya. saya ambil keputusan utk mencuba mnyk Polytron. agak terkejut dgn performance motor bila guna mnyk neh. enjin lebih senyap.. pickup, long distance pon ok. hrga utk moto RM51.. utk kereta tak pasti berapa...

The Mitsu 10w30 is mineral, I've seen the bottle before at AEON. The Mits 5w30 is semi.
Between the 4, I'd pick the Nissan bottle... or maybe the Sukimi 10w30 or Bosch 10w30 on lazada. But it's your call 

Fully synthetic TOTAL QUARTZ 9000 SM 5W40 flash point is 230C
100% mineral oil flashpoint is 302C
100% palm oil flashpoint is 304C

TOTAL QUARTZ viscosity at 40C is 87.28mm2/sec
100% mineral oil is 503.4mm2/sec
100% palm oil is 42.6mm2/sec

TOTAL QUARTZ viscosity at 100C is 14.22mm2/sec
100% mineral oil is 32.51mm2/sec
100% palm oil is 8.65mm2/sec

TOTAL Quartz viscosity index is 169
100% mineral oil is 96.15
100% palm oil is 187

compared to Total Quartz fully-syn oil, pure palm oil (with no additives) has a higher flash point, lower viscosity both at 40 & 100 degree Celsius (I think it's similar to a 0W-20 grade oil) & higher viscosity index (more stable), so palm oil is indeed more superior to some fully-syn oil in some aspects! But we won't know how it will be after additives are added.

Maybe you can experiment by using the palm oil into your engine then tell us the result? 

4. Conclusion

The formulated blends of palm oil show similar properties compared to commercial SAE 20W40 oil in terms of mechanical efficiency, brake thermal efficiency, and brake specific fuel consumption (BSFC). The engine performance and fuel consumption for both lubricants showed no appreciable difference either. The study revealed that by using blends of 25% palm oil the  emission levels are reduced as compared to mineral oil. Also the palm oil-based lubricant is derived from a renewable and lower carbon source; this blended formulation could potentially be considered a good alternative to mineral oil-based lubricants. Since the cost of palm oil based lubricating oil is much lower than the SAE 20W40 mineral oil, the palm oil provides more potential for the successful utilization as base for lubricant oil.

Not really.

The SAE xw30 is better vs xw40 engine oils to maintenance the engine temperature.

The xw30 are less fiction drag between the metal surfaces, hence less heat are generated from the engine.

The xw30 are thinner in viscosity, therefore it does possess a better oil flow in the engine crankcase, and engine heat can be remove quicker compare to the xw40 engine oil.

With that said, xw40 engine oil are unlikely will causing the engine overheat, did you look into the cooling systems, radiator, mixture of coolant, cooling fan….etc.

Don't need to think about boiling point too much for our driving style.

Lower viscosity = faster oil flow = better heat transfer

If you don't believe, go ask those people that own water cooling rig for their computers that have variable pump speed. Observe the temperature differences.

If you want to talk about physics...