15W-40 vs. 5W-40 Oil Type

[jick.cejoco]

for diesel engines, chose API rating of at least CG (C for compression ignited engines or diesels)

[miked]

i use delo gold SAE 40 monograde (i think its a semi syn based dun sa MSDS nya) mula nung naacquire ko 2nd hand pipip ko. as per my experience, it performed better than using the Castrol multigrade. on my own opinion also, hindi na applicable yung winter grade oils sa pinas. plus the thicker the oil, compression is better since it can seal the gap between pistong ring and cylinder (to compensate the wear) as compared to multigrade oils. malamig o mainit, start pa rin agad pipip ko.

[jackaroo]

There is a difference between the 2 viscosities upon start up from a cold engine. The 5w40 will flow faster vs a 15w40 so the thinner oil (5w40) should give relatively better protection from wear. Remember, most engine wear happens on a cold start when the oil is too thick to circulate properly.
The viscosity of both oils at 100deg C is about the same but this also means the engine is fully warmed up. At about 25deg C temp, the 15w40 is thicker when cold vs a 5w40. In the same way, a multigrade oil affords better start up protection vs a monograde.

[Ry_Tower]

The multgrade still offers better protection vs monograde. It is up to you na lang which brand will be preferred. Of course, yung semi- at fully syn na oil ay better kung CRDi na sasakyan mo or talagang heavy duty gamit sa diesel engine.

[miked]

now i've fallen to the hype.....purchased delo gold multigrade yesterday for P740 on a 4-liter gallon and P200 for a 1-liter bottle (total of 5 liters). napakunot noo pa yung caltex attendant kung may stock pa sila eh...halos monograde lang daw kasi, wala halos naghahanap ng multigrade. pati dun sa auto supply na pinuntahan ko..

........will experiment 15w-40 this coming summer....my ride is due for an oil change by april.....will buy next the filter next month...ubos na pera ko....hehehe

[miked]

a little bit confused dearest paps....been used to Delo Gold ISOSYN brand....want to confirm if what i bought (Delo gold multigrade isosyn) is a mineral, semi-syn or fully-syn? my thought is that it is a Group 2 mineral oil refined by using the so-called "ISOSYN" of caltex.....

long story short, a mineral oil refined using refining technology intended for synthetics...am i still on the right track here?....btw, i prefer mineral for some personal reasons and a little bit of technicalities.....

[Ry_Tower]

a little bit confused dearest paps....been used to Delo Gold ISOSYN brand....want to confirm if what i bought (Delo gold multigrade isosyn) is a mineral, semi-syn or fully-syn? my thought is that it is a Group 2 mineral oil refined by using the so-called "ISOSYN" of caltex.....

long story short, a mineral oil refined using refining technology intended for synthetics...am i still on the right track here?....btw, i prefer mineral for some personal reasons and a little bit of technicalities.....

Mineral pa rin yang multi-grade but definitely better than the monograde na delo gold.