I've got about a quart of Mobil 1 0W40 and 3 qts of Quaker State Ultimate Durability 5W30. Would there be an issue if I mixed the two? Mobil 1 0W40 is a "true" synthetic so will its additive pack play nice with the QS?
Mixing 0W40 with 5W30
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No problem mixing 1 qt Mobil 1 with 3 qt Quaker State Ultimate Durability, but the result isn't the best. Safest is mixing same brand and type.
I mixed 60% Mobil 1 0W40 with 40% 0W20 to get about 3.3 HTHS for my S2000 and E430.
I mixed 60% Mobil 1 0W40 with 40% 0W20 to get about 3.3 HTHS for my S2000 and E430.
Originally Posted By: HTSS_TR
but the result isn't the best.
Could you explain what you mean by this?
but the result isn't the best.
Could you explain what you mean by this?
Each oil that meets a set of specifications does so with a combination of different ingredients. If you mix two different oils the result might not meet any given specification that either oil met before the mix. The oils are only guaranteed to be miscible, that is they will mix to form a homogeneous result that will stay mixed. The risk of damage is so small as to be almost non-existent. The risk of increased wear is present however small. The chance that your new mixture will be as good as either oil by itself is remote at best. The chance that it will be better is no chance at all.
OneEyeJack put it very well. Two different brands may have different additives and even different base stock. These different may not cause any impending failure but the result may not be as good as you expected.
Mixing M1 with M1 or Castrol Edge with Castrol Edge ... are usually give good results(thinner or thicker than of the shelf grade)
Mixing M1 with M1 or Castrol Edge with Castrol Edge ... are usually give good results(thinner or thicker than of the shelf grade)
Mobil 1 0w-40 is the only Mobil 1 grade that doesn't have lower calcium and high magnesium. In fact it's very high on calcium, phos, zinc, etc...similar to Pennzoil/QS (no sodium or mg). So while Quaker State Ultimate Durability and Pennzoil Platinum would be the most similar in makeup, the Mobil 1 0w-40 might not be that far away. 3 Quaker State Ultimate Durability 5w30 and 1 Mobil 1 0w-40 will probably get you a PP-like additive package. I have no clue how effective it would be. I'd rather not mix but if you're mixing brands there are far worse choices.
The other Mobil 1 grades would fare better with Castrol with both of them being high mg / low calcium oils.
The other Mobil 1 grades would fare better with Castrol with both of them being high mg / low calcium oils.
This questions come up often, very often. What used to be popular here with mixes is mixing conventional oil with synthetic oil and coming up with a custom blend of a semi synthetic oil of sorts. People often state that mixing within the same brand is usually the best way to go, and I agree with that statement 100%. Then it is mentioned that the final product is hit or miss, and there's no way of truly knowing the outcome, I agree with that as well. I also think there's a chance that the mix might actually end up with a very good product.
Now I think mixing a conventional with a synthetic from the same company EG: Pennzoil conventional with PP might actually be better than buying semi synthetic blend. I'm sure a straight synthetic would be better but people in the market looking for a blend can probably do quite well making their own mix. A 50/50 mix is a good starting point.
Proving the product is better would be extremely difficult though. Fuel for the fire that's all.
Now I think mixing a conventional with a synthetic from the same company EG: Pennzoil conventional with PP might actually be better than buying semi synthetic blend. I'm sure a straight synthetic would be better but people in the market looking for a blend can probably do quite well making their own mix. A 50/50 mix is a good starting point.
Proving the product is better would be extremely difficult though. Fuel for the fire that's all.
Sometimes I do wonder about mixing a 0w-40 or a 5w-40 with an ILSAC grade. Given that a 0w-40 or a 5w-40 likely has ACEA ratings, and that those ACEA ratings aren't going to be A1/B1 A5/B5, I wonder about mixing them with an ILSAC lube. We do know that the additive package of Mobil 1 5w30 SN/GF-5 is probably going to be the same or pretty darned close to that of Mobil 1 10w30 SN/GF-5. But, we will see differences if we compare to an A3/B4 Mobil 1 0w-40 or an E7, E9 Delvac 1.
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