Top Off Oil Choices

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Aug 7, 2020
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I'm planning a long road trip of about 1,600 miles towards the end of the month. The Camry has M1 EP in the sump. It's possible that I may need / want to top off the oil during the trip. I have two 1/2 quarts in stock that I'd like to use for this purpose. One is M1 10W-40 High Mileage and the other is Castrol Edge EP 5W-30. Which do you think would be a better choice to top off with?
 

Shel_B

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Aug 7, 2020
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I'd go buy a fresh quart of M1 EP if I expected to top up over a long trip. Then it's freshly sealed until i need it.
I hear you, but I really want to get rid of these half quarts. I don't have a good place to continue storing them.
 

Shel_B

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Aug 7, 2020
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Castrol uses a different DP /AP with a titanium compound.
I would stick with your M1.
I was thinking of using the M1 HM, but for a different reason. Hadn't thought too much about the formulation. I can use the Castrol in sweeties Prius when we do the next oil change.
 

Shel_B

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Due to leaky bottles?
FWIW, I'm not concerned about the bottles leaking. I've had the opened and tightly closed Castrol in my trunk since 9/1/20, and not a drop has leaked or spilled. If I didn't have these 1/2 used quarts hanging around, I'd certainly go with a fresh quart of M1 EP.
 
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Jul 14, 2020
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The VVT system was designed for 5w-30, so that's what I'd pour into it. It'll undoubtedly be fine with a bit of 10w-40, but there's really no reason to favor same brand of the wrong viscosity over a different brand of the correct viscosity.
 
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