Oil Viscosity not in the manual ...

**Dezaremos** · January 27th, 2018 11:12 PM

If your car's owner's manual say the recommended viscosity is

10w30 or 10w40 ..

What happens if you use 5w30 or 5w40 ??

Is 5w30 too thin for a 20 yr old car ?? Corolla GLi 4afe ..

Currently using Mobil 10w40 ... Last year was using vTec LEV 10w30 ..

**StockEngine** · January 27th, 2018 11:36 PM

Motor Oil 11 - Chapter One - Operating Temperatures and Viscosity - Bob is the Oil Guy

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**oj88** · January 28th, 2018 02:08 PM

You should be ok with a 5W or 10W40 oil.

**StockEngine** · January 28th, 2018 03:07 PM

Originally Posted by oj88

You should be ok with a 5W or 10W40 oil.

and even with a 0w40

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**Dezaremos** · January 28th, 2018 06:33 PM

Originally Posted by StockEngine

and even with a 0w40

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I wanted to try a 5w30 kasi .. Will it be ok with my engine ??

**WallyWest** · January 28th, 2018 09:03 PM

Originally Posted by Dezaremos

I wanted to try a 5w30 kasi .. Will it be ok with my engine ??

If 10w30 is in your owner's manual then 5w30 or 0w30 is also ok. What's important is the "30".

**oj88** · January 28th, 2018 10:24 PM

Originally Posted by StockEngine

and even with a 0w40

Personally... and it's just my opinion... a 20 y/o vehicle will probably be better off with a 5W-xx or 10W-xx. Reason being, the engine might actually benefit from a relatively thicker oil at cold start because part tolerances have presumably loosened up enough that an 0W oil may no longer provide enough initial protection.

Note also that motor oil takes a lot more time to warm up and reach the target viscosity. By comparison, the coolant temperature warms up significantly faster thanks to the thermostat valve, which can reach operating temp in about 5 minutes. Motor oil, however, could take anywhere around 15-20 minutes to reach normal operating temp. In other words, the oil might stay in the lower end of the viscosity range far longer than necessary.

Anyway, I'm just splitting hairs.

**StockEngine** · January 28th, 2018 10:29 PM

Originally Posted by Dezaremos

I wanted to try a 5w30 kasi .. Will it be ok with my engine ??

very similar to the 10w30 honda oil you used. don't worry much...

**StockEngine** · January 28th, 2018 10:34 PM

Originally Posted by oj88

Personally... and it's just my opinion... a 20 y/o vehicle will probably be better off with a 5W-xx or 10W-xx. Reason being, the engine might actually benefit from a relatively thicker oil at cold start because part tolerances have presumably loosened up enough that an 0W oil may no longer provide enough initial protection.

Note also that motor oil takes a lot more time to warm up and reach the target viscosity. By comparison, the coolant temperature warms up significantly faster thanks to the thermostat valve, which can reach operating temp in about 5 minutes. Motor oil, however, could take anywhere around 15-20 minutes to reach normal operating temp. In other words, the oil might stay in the lower end of the viscosity range far longer than necessary.

Anyway, I'm just splitting hairs.

hardly any difference at 40C for 5w30 and 0w40, 72.8 and 75 cSt respectively

Mobil 1 New Life™ 0W-40

Mobil 1™ ESP Formula 5W-30

**Dezaremos** · January 28th, 2018 10:45 PM

Originally Posted by StockEngine

very similar to the 10w30 honda oil you used. don't worry much...

Don't have the manual when I bought it 2nd hand .. But I googled the 4afe engines used in Corollas abroad and it stated that the recommended viscosity is 10w30 or 10w40 ...

But those viscosities are from other countries, I don't know if its applicable here in the philippines tropical climate ...

Unlike your Honda, it is really widely known that 10w30 is the recommended oil viscosity ...