15w-50 Instead Of 15w-40

**nelany** · October 12th, 2005 10:17 PM

Mga Peeps, pwede bang gamitin ang 15W-50 fully synthetic oil instead ng 15W-40 mineral oil sa Crosswind A/T? Meron bang masama kung 15W-40 ang gagamitin? The engine odo is just 15K. Salamat..

**airshaq20** · October 12th, 2005 10:48 PM

1. What is your recommended oil viscosity by your manufacturer?
2. In order for you to use synthetic (from mineral) - you should first do the proper "process of transformation" - or you will have oil leaks, burned oil, etc. Use semi-synthetic first then use synthetic on the next oil change.

**nelany** · October 12th, 2005 11:19 PM

airshaq20, the manual only specify 15W-40. I cannot remember that Isuzu specify the viscosity of the oil in the manual thus I have no comparison.

**BlueBimmer** · October 12th, 2005 11:22 PM

15w50 will be fine if not better, it just means that the oil can withstand higher engine temperature than the 15w40.

**nelany** · October 13th, 2005 10:15 PM

Thanks BlueBimmer,

Will the viscosity not affect the performance of the engine? 15w50 seems to less viscous than 15w40. Salamat.

**BlueBimmer** · October 13th, 2005 10:48 PM

the viscosity is just the same, if it were a 0w50 or 5w50 synthetic oil then that would be significantly thinner. the oils that you are comparing have the same viscosity, but the synthetic oil can protect your engine better * high temperatures.

**nelany** · October 13th, 2005 11:16 PM

Salamat uli.

**Field Master** · February 1st, 2006 02:51 PM

I was confused. Just need some clarification on oil viscosity:
1) For synthethic oil which one is more thinner: 15W-40 or 15W-50?
2) When we say the oil is thinner does it mean that the oil is less viscous?

Thanks.

**islandermike** · February 12th, 2006 05:39 PM

Viscousity means the abilty to flow. 15w-40 and 15w-50 have the same viscousity (15w) but the 50 can withstand a higher temp. Synthetic oil is usually good for new cars since the seals and gaskets have not expanded yet from using a regular oil. Synthetic oil tends to shrink the seals and gaskets, so if you use a synthetic oil after the gaskets have already been expanded for a better fit between two metals, synthetic oil will shrink them back and leak might develop. This is one reason why synthetic oil is not recommended for older cars. Oil viscousity is determined by using the drop ball test, which is dropping two stainless steel balls at the same time in a reference oil and oil being tested para malaman kapag nagbago ang viscousity this is usually done on big engines where changing oil every six months is not very cost effective. Viscosity changes in a dirty or contaminated oil which you can also translate as a change in the oil's ability to flow within your engine. Yon namang you see two numbers such as 15w-50 is because the first one is viscousity itself bago yong 50 is the highest temp it can withstand without the oil breaking down or loses its ability to protect your engine. 5W it thinner than 15W, ginagamit sa malalamig na lugar so that when you start your engine when the outside temp is 10degF oil will still flow to protect.

**acenie** · February 13th, 2006 03:31 PM

Originally Posted by islandermike

Viscousity means the abilty to flow. 15w-40 and 15w-50 have the same viscousity (15w) but the 50 can withstand a higher temp. Synthetic oil is usually good for new cars since the seals and gaskets have not expanded yet from using a regular oil. Synthetic oil tends to shrink the seals and gaskets, so if you use a synthetic oil after the gaskets have already been expanded for a better fit between two metals, synthetic oil will shrink them back and leak might develop. This is one reason why synthetic oil is not recommended for older cars. Oil viscousity is determined by using the drop ball test, which is dropping two stainless steel balls at the same time in a reference oil and oil being tested para malaman kapag nagbago ang viscousity this is usually done on big engines where changing oil every six months is not very cost effective. Viscosity changes in a dirty or contaminated oil which you can also translate as a change in the oil's ability to flow within your engine. Yon namang you see two numbers such as 15w-50 is because the first one is viscousity itself bago yong 50 is the highest temp it can withstand without the oil breaking down or loses its ability to protect your engine. 5W it thinner than 15W, ginagamit sa malalamig na lugar so that when you start your engine when the outside temp is 10degF oil will still flow to protect.

bakit sa diesel 15W40 while gasoline 20W50 here in the philippines. di ba masmainit ang diesel. any comments on this?