Is it safe to mix 0W20 and 5W30 in 75/25 proportion of the same oil brand and type?

[SammyChevelleTypeS3]

I’m about to run Amsoil SS 0W30 in my wife’s Pilot. Just like the thick cool kids do. I already run SS 0W20.

I have some Amsoil SS 0w30 in my shop just waiting for use in the 2009 Honda Accord that has been on 5w20 for years doing fine. I am just going to use it since I have it and already use HPL in the other car. The 5w20 has been fine oil since day one in that engine. Plus an oil change in that car lasts me at least 12mo since I put very little miles on that car anyway. Plan to give it to nephew in a few months when we get another vehicle. Looking at Toyota Rav4 / Honda CRV and Honda HRV and possibly a Honda Hybrid.

 

[Scotty00]

"Run Mobil 1 FS 0W-40 in that engine. It will last much longer, trust me on that. I have owned several of those 2.4L GDI engines and always used oil with an HTHS (High Temperature High Shear) viscosity of 3.5 or higher. These engines have a dual oil pump, which is part of the balance shaft assembly, so they have no issue moving oil around. What they lack are decent rod bearings. The rod bearings are too narrow to handle the pressure inside the cylinder when under load. The best thing you can do is run a higher HTHS motor oil in it.

The engine OP is talking about in the 2012 Accord isn’t GDI, Honda didn’t start direct injection in that engine until the following year…I highly recommend Pennzoil Platinum 5w30, I run it in our 2012 Honda Accord EX-L 2.4 and it’s the quietest and smoothest it’s ever ran using that oil!

 

[Triple_Se7en]

Noise is usually bad, quiet is good just run the 5w-30.

I'm glad you said 'usually' and not 'always'.

My wife's Kia uses absolutely nothing (no consumption) on the noisy oil I won't mention here.
One OCI later, it uses plenty on the quietest oil I ever tried in her 2.0 MPI engine.

What's really odd is 'usually' the thicker oil uses less oil and that certainly wasn't the case currently (28k).
My Hyundai GDI (39k) uses nothing-ever and it doesn't matter what brand name or viscosity I give it.

 

[ndarkside93]

Hi All, I would appreciate an advice here. I am thinking of trying this Valvoline Restore & Protect motor oil in my Honda Accord 2012 4 cyl with 200K mi for the benefits described in this video by Lake Speed, Jr. on YouTube. Honda recommends 0w20 for all year round in my Honda Accord according to the manual. However, the kinematic viscosity at 100C of this Valvoline Restore & Protect 0W20 oil is a bit on the lower side for my engine - it has 8.4 according to Valvoline PDS. I used Valvoline Extended Protection 8.4 oils in the past and the engine performed quite noisier than with oils of higher visc@100C coefficient. In order to raise kinematic viscosity coefficient at operating temperature, I am thinking to mix Valvoline Restore & Protect oil where I use 75% of 0W20 with 8.4 and 25% of 5W30 with 10.8 visc@100C. Again, both 0W20 and 5W30 will be Valvoline Restore & Protect, just different viscosities.This will provide me with roughly 9.0 visc@100C that is better viscosity number for my engine. It's just putting 5W30 by itself with 10.8 is too much that's why I am considering to go for a 75/25 mix.Please share you insight regarding this. Much appreciated your take on that.

I would run straight 5w30 r&p in that engine. I’ve ran ESP 0w30 with no issues in the k24 in my previous Honda

 

[OilStainedNapkin]

Just go straight 0w20 or 5w30, don’t mix viscosities. And all this talk about valve train noise is kind of useless without knowing exactly how the engine is wearing (uoa)

 

[kschachn]

Just go straight 0w20 or 5w30, don’t mix viscosities. And all this talk about valve train noise is kind of useless without knowing exactly how the engine is wearing (uoa)

For what reason?

 

[FCD]

I've done it many times to create my own brews, no problem at all especially if they are the same brand and specs.

 

[i6pwr]

For the longest time on my Envoy, I used 6 qts of M1 EP 5W-30 and 1 qt of M1 V-Twin 20W-50. Need to do a VOA but the V-Twin adds a little kick of Mg,Ca, and Zn.

I still mix this on occasion in my L94 6.2, yields an approximate 7.5W-33

Does this help, hard to say but for my own piece of mind, I feel it gives a little more to a 140K miles engine in regards to shearing, additive longevity and viscosity over the 5-6K OCI.