Mobil 1 5w50 for high mileage V6CDTi - yes or no?

**Celes** · 25th January 2010, 23:48

Hello there!
Just ordered 8L of Mobil 1 5w50 Rally Formula oil

I currently have GM LL 5w30 in but I find the engine louder (when warmed up it's clapping a bit) than with 10w40 oil.

Your thoughts on the 5w50 oil?

**mattv6diesel** · 25th January 2010, 23:53

should be ok the dealer i use, uses 5w30. So slightly thicker but should be ok. Does your book list oil grades

**Celes** · 26th January 2010, 00:04

Doesn't mention 5w50, but the Mobil 1 5w50 meets Vx specs for oils.

**mattv6diesel** · 26th January 2010, 00:05

should be fine then

**Celes** · 26th January 2010, 00:39

**m8internet** · 26th January 2010, 09:54

5W50 is not API or ACEA compliant

Compare the specifications between 5w30 and 5w50

http://www.mobil.com/Canada-English/...il_1_5W-30.asp

http://www.mobil.com/Australia-Engli...bil1_5W-50.asp

5W50 is vastly thicker, as can be seen by the CST and higher viscosity rating
Personally I wouldn't use it

**Celes** · 26th January 2010, 14:03

Meets or exceeds ACEA A3/B3, API SM/SL/SJ/CF...hmm

**James24** · 26th January 2010, 14:34

What about the latest GM-LL-A025 and GM-LL-B025 specs? They're what I always check for on any oil that I buy.

**Jezzy** · 26th January 2010, 16:00

Originally Posted by James24

What about the latest GM-LL-A025 and GM-LL-B025 specs? They're what I always check for on any oil that I buy.

If you have the correct viscosity, Mobil1 exceeds the GM-LL-A/B025 standards.

**James24** · 26th January 2010, 16:12

Originally Posted by Jezzy

If you have the correct viscosity, Mobil1 exceeds the GM-LL-A/B025 standards.

I guess that's why the Mobil1 5w50 doesn't appear to have GM-LL-A025 or GM-LL-B025 approval on it.

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