Which Diesel Engine Oil...

**scanner** · October 14th, 2003 09:55 PM

Regarding po dun sa orig question ko kasi napansin ko na API-CF rating lang po yun Mobil 1 superSyn dun sa lalagyan. Does this mean bumsteer lang po ba yun pagkahype nito sa ads?:confused:

**jackaroo** · October 15th, 2003 12:01 AM

scanner,
The mobil 1 supersyn was meant for gas engines(SL/SJ) but is also rated for diesel(CF). They have one meant for diesels, Delvac 1, which is rated CH4. Your mobil 1 was just not optimized for diesel engines but it's compatible.

**scanner** · October 15th, 2003 01:42 AM

sir jackaroo : what do you mean by " not optimized but compatible" ? Im starting to get the feeling i erred on my choice of oil. Para tuloy gusto ko alisin agad. hehehehe

**jackaroo** · October 15th, 2003 01:10 PM

scanner
The different API ratings have evolved with the requirements of engines, fuel and emissions but basically differ in the type of additives used. The API CF was meant for higher sulfur levels in diesel fuel, non direct injection engines thus may have higher TBN, sulfated ash content vs the newer CG/CH oils. If your engine is not a high tech one then CF is ok since we do have higher sulfur levels vis-a-vis developed nations. Your car's manual should specify the minimum requirement for API.

IMO, full synth oil, even at CF, is superior to a mineral oil rated at CG/CH. The synth base oil will offer better protection rather than a good additive package in mineral oil. The additives wear out with soot, carbon, acid dilution leaving the base oil as a friction buffer.

**scanner** · October 15th, 2003 09:58 PM

Haay salamat po! Akala ko nagtapon lang ako ng pera .Hehehe

**roydok** · October 17th, 2003 10:18 PM

I agree with sir jackaroo.

**turk182** · October 18th, 2003 02:49 AM

hmm... the right API rating to use really depends on the diesel oil specs recommended by your owner's manual... like in the case of my GU Patrol, the use of synthethic oil is prohibited and the oil's API rating is recommended not to exceed CF-4...

so, in my case, it doesn't follow that the higher the API rating, the better it is... you should always consult your owner's manual for the recommended API and viscousity rating for your engine oil...

for our hot weather conditions, the recommended viscousity rating for engine oil is 15/20w-40/50... 5/10w oils are meant for cooler climates....

**notEworthy27** · October 18th, 2003 04:44 AM

does casa now best? would they be credible enough to advise you on what type of oil to use? or theyd just be biased on their endorsement?

**scanner** · October 18th, 2003 10:30 AM

sir noteworthy : i think we can expect the casa to at least allow the minimum specs but will not object if you have something better. experience ko lang po ito sa isuzu alabang.
By the way po. Seaoil Deo turbo max is available at P395/gal and 105/liter at Seaoil in Sucat Road near the interchange kung magawi po kayo dun.

**jackaroo** · October 20th, 2003 12:34 PM

turk182
Just curious, why is synth oil prohibited in the nissan GU engine and why can't it exceed a CF4 rating? What oil do they recommend or use at the casa?

**turk182** · October 20th, 2003 08:13 PM

dunno... there's a warning label on the intercooler cover stating that only mineral oil should be used and this is also stated on the GU owner's manual with a recommendation not to exceed CF-4...

a nissan service advisor told me that a GU Patrol using synth oil came to their shop with the engine smoking all over... the Patrol was only about 6 months old and the engine was already virtually finished... no warranty was given and the owner already had to overhaul his engine... tsk..tsk...

**roydok** · October 22nd, 2003 11:01 PM

Hmmm...iyan din po minsan ang sinabi ng isang tsikoteer dito. It's still best to follow your manufacturer's recommendation regarding the correct diesel oil to use for your engine which in your case is API CF-4. Though you can check the oils specs sa back ng oil packaging. Some oil brands though rated API CH-4 are also rated CG-4, CF-4. CF which in this case I think can be used with your Patrol.

**turk182** · October 23rd, 2003 10:39 AM

But the GU owner's manual specifically states NOT to exceed CF-4... This means that even if the oil is rated CF-4 and above, it still exceeds the CF-4 rating and therefore not recommended for use with my vehicle...

My Patrol is due for its 1K PMS and its engine (ZD30DDTic) seems to be picky when it comes to engine oil from the horror stories I've heard... That's why I'm making sure that I use the right kind of engine oil with it...

I'm leaning towards the Castrol CRD Plus with a CF-4 API rating and a viscousity rating of 20W-40 which is also recommended by the manual due to our generally hot weather conditions... 5/10W oil is for cool climates...

**roydok** · October 23rd, 2003 11:22 PM

Originally posted by turk182
But the GU owner's manual specifically states NOT to exceed CF-4... This means that even if the oil is rated CF-4 and above, it still exceeds the CF-4 rating and therefore not recommended for use with my vehicle...

My Patrol is due for its 1K PMS and its engine (ZD30DDTic) seems to be picky when it comes to engine oil from the horror stories I've heard... That's why I'm making sure that I use the right kind of engine oil with it...

I'm leaning towards the Castrol CRD Plus with a CF-4 API rating and a viscousity rating of 20W-40 which is also recommended by the manual due to our generally hot weather conditions... 5/10W oil is for cool climates...

Maganda din po ang Castrol CRD-Plus.

**jackaroo** · October 24th, 2003 01:12 AM

turk182
I'd suggest a 15w40 viscosity oil while engine is new. The thinner grade helps in proper break-in while engine is still tight. Think Castrol is ok but don't know if they carry a 15w40/ CF4 oil.

Pls ask them why synth oil is not allowed and why only CF4 rating. Should be an interesting explanation. Thanks.

**turk182** · October 24th, 2003 03:11 AM

here's a quote from the Castrol site which may partly explain the CF-4 rating limitation:

The API C grade was developed to regulate gas emissions in North American, but with locally manufactured diesel engines in mind and therefore the relevant tests are only performed using engines manufactured in North America. As the differences in gas emission regulations between Japan and North America gradually grew, it became apparent that even high quality oils of CG-4 and CH-4 grade were NOT always suitable for Japanese manufactured large diesel engines. Consequently, JASO developed a grade that uses Japanese manufactured engines in testing and is more suited to Japanese large diesel engines, known as JASO DH-1. This grade applies to oil suitable for use in Japanese commercial diesel vehicles.

So, according to this statement, the JASO DH-1 rating seems to correspond to API CF-4 rating which is the one recommended for the GU Patrol's ZD30DDTic engine.

As for the 15w40 oil, the 15W corresponds to max. low temp. range of -20C which we will never encounter here in the Phil. anyway so 20W oil will suffice... what i think is more impt. is the latter no. since it corresponds to the high temp. range so using oil with suffix nos. of 40-50 is important especially in warm climates... That's why oil grades of 5w20/30 are unsuitable for turbo-charged engines as well as sustained high-speed driving and 10w30 oil is only recommended for cold environs...

Many synth diesel oils are rated above CF-4 (JASO DH-1) as well as having viscousity ratings of 5/10w20/30 which may explain the prohibition of using it with the GU Patrol especially in Phil. weather...

**roydok** · October 24th, 2003 07:18 PM

Castrol does sell locally a 15W-40 weight oil. It's the Castrol GTD but is currently rated API CH-4. It was previously rated as CF-4 but with the current introduction of the low sulfur diesels in the Phil. Market due to the Clean Air Act then they upgraded it to CH-4.

**turk182** · October 25th, 2003 01:27 AM

i think rather than being fixated on API ratings which are based on tests performed using engines manufactured in North America, it would be better to be guided instead by JASO ratings which use Japanese engines in their tests... Most if not all diesel-powered SUVs and AUVs available in our local market have engines made in Japan...

**roydok** · October 25th, 2003 01:47 AM

I agree. Aside from the API we should also see if the diesel oil would also confirm with the latest JASO DH-1 tests or the Global DHD-1 (combination of JASO DH-1, ACEA E5 and API CH-4 tests).

**turk182** · October 25th, 2003 02:11 AM

i've noticed that the sticky thread on Diesel Engine Oil Specification Database is missing... where did it go and is it possible to revive that thread??

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