oil: 10w/40 or 15w/50

busenbust

thank you all you fabulous people!!:)

15w/50 asda brand it is!

TiTheRev

LandyAndy wrote: »

Are you sure.

Modern oils like 5w/30s seem a lot runnier than the 20w/50 I put in the Landy.

Exactly! The 5w30 is a higher viscosity than the 20w50...

LandyAndy

http://www.autoeducation.com/autoshop101/oil-change.htm

or

http://auto.howstuffworks.com/question164.htm

LandyAndy

TiTheRev wrote: »

Exactly! The 5w30 is a higher viscosity than the 20w50...

Viscosity. A runnier oil has a lower viscosity than a thicker one. So 5w/30 is runnier, so has a lower viscosity.

busenbust

TiTheRev wrote: »

Actually no :rolleyes:

Oh no, I thought i was onto a winner! Any Consensus ? I really don't want to ruin the engine.

TiTheRev

It's all semantics get the 15w40 or 15w50.

My understanding = 5w30 is 5 when warm, 30 when cold, thus a thicker oil will help the more worn engine.

LandyAndy

busenbust wrote: »

Oh no, I thought i was onto a winner! Any Consensus ? I really don't want to ruin the engine.

Read this.

http://auto.howstuffworks.com/question164.htm


Runny = low viscosity

Thick = high viscosity

20W/50 is the way to go.

LandyAndy

TiTheRev wrote: »

It's all semantics get the 15w40 or 15w50.

My understanding = 5w30 is 5 when warm, 30 when cold, thus a thicker oil will help the more worn engine.

If by semantics you mean understanding what a word means I agree with you;) .

TiTheRev

Apologies for the confusion Landy

espresso

TiTheRev wrote: »

It's all semantics get the 15w40 or 15w50.

My understanding = 5w30 is 5 when warm, 30 when cold, thus a thicker oil will help the more worn engine.

Your understanding is wrong then!

The SAE designation for multi-grade oils includes two grade numbers; for example, 10W-30 designates a common multi-grade oil. Historically, the first number associated with the W (again 'W' is for Winter, not Weight) is not rated at any single temperature. The "10W" means that this oil can be pumped by your engine as well as a single-grade SAE 10 oil can be pumped. "5W" can be pumped at a lower temperature than "10W" and "0W" can be pumped at a lower temperature than "5W". The second number, 30, means that the viscosity of this multi-grade oil at 100°C (212°F) operating temperature corresponds to the viscosity of a single-grade 30 oil at same temperature. The governing SAE standard is called SAE J300.