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Bought 5 qts of Penzoil Ultra Syn 5w 20 and 1 qt of 5w 30 - didn't notice the 5 qt bottle was 5w 20 and not 30 until after both bottles were distributed into the XK...do I need to drain and replace now or can I wait till the next oil change???The fumoto drain valve makes this easy, paying for 6 qts of syn makes me ask the question...thanks ahead of time, and yes I "know" to measur twice and cut once, just don't always follow through :)
 

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It will be fine, leave it in. Robby will probably give you a much more technical answer, but the short version is that you will be fine leaving it in. Especially in the Summer.
 

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I would agree with Huey too ,,, now you have a unique viscosity :) ,, 5W22 :)
 

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Bought 5 qts of Penzoil Ultra Syn 5w 20 and 1 qt of 5w 30 - didn't notice the 5 qt bottle was 5w 20 and not 30 until after both bottles were distributed into the XK...do I need to drain and replace now or can I wait till the next oil change???The fumoto drain valve makes this easy, paying for 6 qts of syn makes me ask the question...thanks ahead of time, and yes I "know" to measur twice and cut once, just don't always follow through :)
You'll be fine.
Looks like Ahmed figured your new viscosity formula.

Won't hurt a thing, don't give it a thought.

Rob
 

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Discussion Starter #5
Thanks all...I feel much better now, still stupid, but better!
 
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