Oil Mixing results?
- Thread starter tr4petty
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If you want to do it then just do it. There will be no problems.
No problems IMO, but someone will come along with the opposite opinion.
No Problem. Youll end up with a 10W30.
see below
Right - something like a 7.5-30.
Keep it the same brand if you have a choice.
But any SM oil will mix - it has to.
Keep it the same brand if you have a choice.
But any SM oil will mix - it has to.
I ended up buying some closeout TropArtic 5w30 and 10w30. I mixed them together for a couple of oil changes. I had zero problems, and while it may have been my inagination, it seemed as though the engine ran just a bit better on this custom viscosity oil.
While we are on the subject of mixing oil, Can you mix a Pennsylvania grade oil with a Texas grade oil at the same time in the same engine? I was told not to do this a long time ago by a pretty good mechanic. Not sure how to distinguish the two either. Thanks!
Originally Posted By: 08_SHELBY
While we are on the subject of mixing oil, Can you mix a Pennsylvania grade oil with a Texas grade oil at the same time in the same engine? I was told not to do this a long time ago by a pretty good mechanic. Not sure how to distinguish the two either. Thanks!
LOL
While we are on the subject of mixing oil, Can you mix a Pennsylvania grade oil with a Texas grade oil at the same time in the same engine? I was told not to do this a long time ago by a pretty good mechanic. Not sure how to distinguish the two either. Thanks!
LOL
Originally Posted By: 08_SHELBY
While we are on the subject of mixing oil, Can you mix a Pennsylvania grade oil with a Texas grade oil at the same time in the same engine? I was told not to do this a long time ago by a pretty good mechanic. Not sure how to distinguish the two either. Thanks!
Sure, you can mix them. Just stay away from the Massachusetts grade oil, because you'll pay more in tax.
While we are on the subject of mixing oil, Can you mix a Pennsylvania grade oil with a Texas grade oil at the same time in the same engine? I was told not to do this a long time ago by a pretty good mechanic. Not sure how to distinguish the two either. Thanks!
Sure, you can mix them. Just stay away from the Massachusetts grade oil, because you'll pay more in tax.
Originally Posted By: tr4petty
If I use 3 quarts of 5w30 Mopar oil and 3 quarts of 10w30 Mopar motor oil in my Grand Cherokee 4.0L, (it takes 6 quarts) will I get a 7.5w30 oil? Are there any problems with doing this?
The correct answer too the first question is maybe. Your math is wrong. You cant just avg 5 5 5 10 10 and 10 and assume your gonna get a 7.5w. The reason is to be called a 5w is simply must have a max viscosity of 3500cP at-25C. My point is it would depend on what you mixed. If you mixed a light 5w30 like PP and 10w30 like pp, half and half, you would simply end up with a 5w30. If your point is, will mixing a 5w30 with a 10w30 increase the cold weather flow of the 10w30, then again it is maybe. If they use the same basestocks then it would be yes the 10w30 should get less viscous at lower temps. But if you take a synthetic like Mobil 1 10w30 and mix it with a lower quality 5w30 conventional, there is a chance that you could make the 10w30 worse at very cold temps. If you really want to find what viscosity you have after mixing, you need to get the 40C and 100C viscosities off the manufacture data sheet and use this equation Vblend=EXP(((P1*LN(V1)+(P2*LN(V2)))/(P1+P2))) Where V1 and V2 are the viscosities of each oil at a temp. You will need too do it twice, one for 100C and once for 40C. P1 and P2 are parts of each. So if 3 qts of the fist then V1 is 3 and so on. This will get you very close to the blended viscosity. Sorry this got very long. Ill try to post a spreadsheet that does this for you in a new thread. To be the most accurate in blending, try to stick to similar oils. When mixing HQ synthetics with lower ones or dino, all bets are off and it is way to difficult to actually calculate it correctly. Hope this helped.
If I use 3 quarts of 5w30 Mopar oil and 3 quarts of 10w30 Mopar motor oil in my Grand Cherokee 4.0L, (it takes 6 quarts) will I get a 7.5w30 oil? Are there any problems with doing this?
The correct answer too the first question is maybe. Your math is wrong. You cant just avg 5 5 5 10 10 and 10 and assume your gonna get a 7.5w. The reason is to be called a 5w is simply must have a max viscosity of 3500cP at-25C. My point is it would depend on what you mixed. If you mixed a light 5w30 like PP and 10w30 like pp, half and half, you would simply end up with a 5w30. If your point is, will mixing a 5w30 with a 10w30 increase the cold weather flow of the 10w30, then again it is maybe. If they use the same basestocks then it would be yes the 10w30 should get less viscous at lower temps. But if you take a synthetic like Mobil 1 10w30 and mix it with a lower quality 5w30 conventional, there is a chance that you could make the 10w30 worse at very cold temps. If you really want to find what viscosity you have after mixing, you need to get the 40C and 100C viscosities off the manufacture data sheet and use this equation Vblend=EXP(((P1*LN(V1)+(P2*LN(V2)))/(P1+P2))) Where V1 and V2 are the viscosities of each oil at a temp. You will need too do it twice, one for 100C and once for 40C. P1 and P2 are parts of each. So if 3 qts of the fist then V1 is 3 and so on. This will get you very close to the blended viscosity. Sorry this got very long. Ill try to post a spreadsheet that does this for you in a new thread. To be the most accurate in blending, try to stick to similar oils. When mixing HQ synthetics with lower ones or dino, all bets are off and it is way to difficult to actually calculate it correctly. Hope this helped.
Sorry, i just reread your post, and noticed your using MC 5w and 10w30, so yes most likely you will increase cold weather flow by mixing them. You probably aren't gonna change it all that much. i dont have the specs for the oil so i cant say for sure. There usually isnt a large spread between the two grades at temps above 0F or so. If you arent in temps regularly that are lower than 0F, i believe i would probably just stick to the 10w30 as they usually have very little viscosity improvers, Higher HTHS, and lower volatility. Granted these are small improvements and todays vii's are pretty good so sheering is not usually a problem. Im just saying, if you dont need the improved cold weather flow, just run the 10w30. It wont hurt no matter what you do so you could run straight 5w30 or 10w30 or mix them. I have always heard that the jeeps like the little thicker oils. Running a 10w30 in the jeep at anything over 0F or really probably -10F would be just fine, but the 5w wont hurt. I know many people that run 5w40s and 15w40s in the 4.0. Im not an expert on these engines but most of the jeepers i go with run that. They are into 4wd so maybe its not relevant to a daily driver. Good luck and luckily you cant make a wrong decision.
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