Mixing Engine Oil

[Guardsboy]

Can I mixed Mobil 1 5W-30 and 5W-50 ?

How abt different brand like Shell Helix 0W-40 and Mobil 1 5W-30 ?

I am refering to those left over 0.5L after each servicing.

 

 

Thanx

[Genie47]

No problem can mix. Might have additive clash but usually no. Wah! Mix equally can get a 5W35.

[Apollo]

mixing of mineral oil is generally acceptable.

 

mixing of semi syn is not encouraged

 

mixing of synthetic of the same brand (usually difference is in the viscousity additives, etc) are ok

 

mixing of different brand of synthetic is highly discouraged. cos each coy hv their own formulation. when subjected to heat, oxidisation of engine oil and with different additives will produce unknown (X) results.

 

think... how much does a new engine block cost u?

[Genie47]

mixing of different brand of synthetic is highly discouraged. cos each coy hv their own formulation. when subjected to heat, oxidisation of engine oil and with different additives will produce unknown (X) results.

 

You are contradicting yourself here with every statement above. Even though oils are manufactured under the same manufacturer, oils of different API grading are vastly different creatures from one another. Mobil1 Supersyn Silver 5W50 is a completely different creature from Mobil1 Supersyn Gold 0W40. Likewise, RP 5W20 is a vastly different creature from the 5W30 in terms of base stock ratios, additives, in fact the whole formulation even though one is just a grade above another!

 

As long as oil reaches its operating temperature, lubrication is at its best. The whole idea is to reach operating temperature always before attempting to stress the engine more. With a mixed oil, you will eventually reach operating temperature for lubrication. Just that with the grade you have just concocted, it might take longer or shorter. Who knows unless your car comes with a oil temperature and oil pressure gauge.

[Vit4wd]

Everytime you change engine oil, there is sure to be at least 300ml of old oil left behind.

 

When you pour in the new engine oil of a different brand, that's also mixing engine oil

[Genie47]

Sort of explains why I always get moly in the UOA. I've been using more of RP than any other oil. Even when I change to an oil with no moly, the moly numbers still shows up.

[Trex101]

Well, I should think that's it ok to mix if using the same brand of oil. I have mix 2.5qt of RP5w30 to 1qt of RP15w40 to achieve a cSt@100'c : 12.0

A little dose of 15w40 may actually help in boosting the detergent/dispersants level in the brew.

[Cool_jazz]

Can I mixed Mobil 1 5W-30 and 5W-50 ?

How abt different brand like Shell Helix 0W-40 and Mobil 1 5W-30 ?

I am refering to those left over 0.5L after each servicing.

 

 

Thanx

 

 

IMHO, it does not matter

http://theoildrop.server101.com/cgi/ultima...ic;f=1;t=009050

[Apollo]

Who knows unless your car comes with a oil temperature and oil pressure gauge

-----------

spot on.......

 

how u ever guess?

 

Edited January 22, 2005 by Apollo

[Clio]

not sure dont mix

save how much only?

0.5l use for your bicycle chain or anything that needs to be lubricated lah.

if u adventurous can try using for your

 

[Genie47]

Just drive gently lor!

[Goodspeed]

Can I mixed Mobil 1 5W-30 and 5W-50 ?

How abt different brand like Shell Helix 0W-40 and Mobil 1 5W-30 ?

I am refering to those left over 0.5L after each servicing.

 

 

Thanx

 

 

hey there.. i did mixing for 3 different brand of engine oil but of coz... they are all at the 50 mark... which is what we need in singapore... the 5W or 10W not really applied to us.. anyway i noticed a drop in engine oil after mixing and FRANKLY dont save on these kind of money lah... are u driving a new car?

[Madsumm]

Hey.. I tot you can only mix with similar viscosity value.. not mix with diff viscosity and even different brands with diff viscosity..

 

Rgds

[Sky8807]

IMO, no problem.

But once u settle with the oil type of your choice, stick to it.

If you keep on changing oil brands on every oil change, then some rojak will always be inside, we don't really know.

hOWEVER, oil change, use those oil machine to suck out the oil during oil change, heard that it does a better job of clearing the used oil compared to the gravity draining method.

Edited January 27, 2005 by Sky8807

[Genie47]

Even same viscosity level from different brands have different additive packages. Dunno if some might lang-gah and cancel each other out. Like I've mentioned above, even with same brands different viscosity level, different package. In general it is safe to mix.

[Fury]

If you mix viscosity grades such as a 5W30 low-viscosity oil and a 10W40 higher-viscosity oil, it is reasonable to expect that the resulting product will have viscosity characteristics which are thicker than the 5W30, but thinner than the 10W40. This change does not reflect incompatibility - it's simply a re-balancing of the viscosity characteristics. In all other ways, the product should work as expected.

 

Shell's Staff Research Engineer have tested all of our grades and brands, and they haven't observed any problems.

[Peal_red]

I think that mixing of engine oil is no good because the engine oil boils at different and so it means that the particles will be seperated and so the protection is not there already. so i think that it is not good to mix the engine oil